{
  "startDate": "2015-09-02T00:27:03Z",
  "stopDate": "2025-08-29T23:04:17Z",
  "sampleStartDate": "2025-08-25T16:07:01Z",
  "sampleStopDate": "2025-08-26T07:14Z",
  "cadence": "PT58.085164S",
  "x_cadence_fraction": 0.01834862385321101,
  "x_cadence_note": "Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/mms/mms2/fpi/slow/l2/des-moms/2015/09/mms2_fpi_slow_l2_des-moms_20150902002703_v3.4.0.cdf. The most common cadence, 58085164000 [ns] = PT58.085164S, occurred for 1.8349% of the 2 timesteps.",
  "maxRequestDuration": "PT2720950S",
  "resourceURL": "https://cdaweb.gsfc.nasa.gov/misc/NotesM.html#MMS2_FPI_SLOW_L2_DES-MOMS",
  "contact": "J. Burch, D. Gershman @ SwRI, GSFC",
  "parameters": [
    {
      "name": "Time",
      "type": "isotime",
      "units": "UTC",
      "length": 30,
      "fill": null,
      "x_description": "Nanoseconds since J2000",
      "x_cdf_NAME": "Epoch",
      "x_cdf_DataType": "CDF_TIME_TT2000"
    },
    {
      "name": "mms2_des_errorflags_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_UINT4",
      "description": "MMS2 FPI/DES vector of data-quality indicators at survey-start time. Note: CDF_UINT4 data was converted to HAPI double.",
      "fill": "4.294967295E9",
      "units": "32-bit error flags",
      "x_label": "errFlags",
      "x_cdf_FORMAT": "I10",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES dataQuality errorFlags",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms2_des_startdelphi_count_slow",
      "type": "integer",
      "x_cdf_DataType": "CDF_UINT2",
      "description": "MMS2 FPI/DES Del-Phi (obs spin-phase) count at survey-start time",
      "fill": "65535",
      "units": "del-phi counts",
      "x_label": "DelPhi_cnt",
      "x_cdf_FORMAT": "I4.4",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES start Del-Phi count",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms2_des_startdelphi_angle_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES Del-Phi (obs spin-phase) angle at survey-start time",
      "fill": "-1.0E31",
      "units": "deg",
      "x_label": "DelPhi_ang",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES start Del-Phi angle",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms2_des_pitchangdist_lowen_slow",
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      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron pitch-angle distribution for \"low\" energies during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "PAD_low",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES pitchAngDist_lowEn",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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      "bins": [
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          "name": "mms2_des_alpha_slow",
          "description": "MMS2 FPI/DES slow survey sky-map pitch angles",
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            66,
            78,
            90,
            102,
            114,
            126,
            138,
            150,
            162,
            174
          ],
          "x_label": "pitch_ang",
          "units": "deg"
        }
      ]
    },
    {
      "name": "mms2_des_pitchangdist_miden_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron pitch-angle distribution for \"mid\" energies during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "PAD_mid",
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      "x_fractionDigits": "2",
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      "x_cdf_FIELDNAM": "MMS2 FPI/DES pitchAngDist_midEn",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
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            54,
            66,
            78,
            90,
            102,
            114,
            126,
            138,
            150,
            162,
            174
          ],
          "x_label": "pitch_ang",
          "units": "deg"
        }
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    },
    {
      "name": "mms2_des_pitchangdist_highen_slow",
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      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron pitch-angle distribution for \"high\" energies during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "PAD_high",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES pitchAngDist_highEn",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
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          "description": "MMS2 FPI/DES slow survey sky-map pitch angles",
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            18,
            30,
            42,
            54,
            66,
            78,
            90,
            102,
            114,
            126,
            138,
            150,
            162,
            174
          ],
          "x_label": "pitch_ang",
          "units": "deg"
        }
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    {
      "name": "mms2_des_energyspectr_px_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy spectrum \"near\" +X_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_px",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_pX",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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    },
    {
      "name": "mms2_des_energyspectr_mx_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy spectrum \"near\" -X_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_mx",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_mX",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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    },
    {
      "name": "mms2_des_energyspectr_py_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy spectrum \"near\" +Y_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_py",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_pY",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_energyspectr_my_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy spectrum \"near\" -Y_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_my",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_mY",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_energyspectr_pz_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy spectrum \"near\" +Z_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_pz",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_pZ",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_energyspectr_mz_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy spectrum \"near\" -Z_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_mz",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_mZ",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_energyspectr_par_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy parallel to the magnetic field direction during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_par",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_par",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_energyspectr_anti_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy anti-parallel to the magnetic field direction during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_anti-par",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_anti",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_energyspectr_perp_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron energy perpendicular to the magnetic field direction during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_perp",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_perp",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_energyspectr_omni_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES omni-directional electron energy spectrum during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_omni",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES energySpectr_omni",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_numberdensity_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron number density during this survey",
      "fill": "-1.0E31",
      "units": "cm^-3",
      "x_label": "N",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES number density",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms2_des_densityextrapolation_low_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES estimated (via extrapolation to 0) contribution to density integral below 10eV",
      "fill": "-1.0E31",
      "units": "cm^-3",
      "x_label": "N",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES density extrapolation (low)",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms2_des_densityextrapolation_high_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES estimated (via extrapolation to infinity) contribution to density integral above 30keV",
      "fill": "-1.0E31",
      "units": "cm^-3",
      "x_label": "N",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES density extrapolation (high)",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms2_des_bulkv_dbcs_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron bulk-velocity vector in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
        "Vx_DBCS",
        "Vy_DBCS",
        "Vz_DBCS"
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES DBCS bulk v",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_bulkv_gse_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron bulk-velocity vector in GSE during this survey",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
        "Vx_GSE",
        "Vy_GSE",
        "Vz_GSE"
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES GSE bulk v",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_prestensor_dbcs_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron pressure tensor in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "nPa",
      "x_label": "P_DBCS",
      "x_labelComponents": [
        [
          "x",
          "y",
          "z"
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        [
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          "y",
          "z"
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      ],
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      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES DBCS pres tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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        3
      ]
    },
    {
      "name": "mms2_des_prestensor_gse_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron pressure tensor in GSE during this survey",
      "fill": "-1.0E31",
      "units": "nPa",
      "x_label": "P_GSE",
      "x_labelComponents": [
        [
          "x",
          "y",
          "z"
        ],
        [
          "x",
          "y",
          "z"
        ]
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      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES GSE pres tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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        3
      ]
    },
    {
      "name": "mms2_des_temptensor_dbcs_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron temperature tensor in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "T_DBCS",
      "x_labelComponents": [
        [
          "x",
          "y",
          "z"
        ],
        [
          "x",
          "y",
          "z"
        ]
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES DBCS temp tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        3,
        3
      ]
    },
    {
      "name": "mms2_des_temptensor_gse_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron temperature tensor in GSE during this survey",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "T_GSE",
      "x_labelComponents": [
        [
          "x",
          "y",
          "z"
        ],
        [
          "x",
          "y",
          "z"
        ]
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES GSE temp tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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        3
      ]
    },
    {
      "name": "mms2_des_heatq_dbcs_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron heat-flux vector in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "mW/m^2",
      "x_label": [
        "Qx_DBCS",
        "Qy_DBCS",
        "Qz_DBCS"
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES DBCS heatq",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms2_des_heatq_gse_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron heat-flux vector in GSE during this survey",
      "fill": "-1.0E31",
      "units": "mW/m^2",
      "x_label": [
        "Qx_GSE",
        "Qy_GSE",
        "Qz_GSE"
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI/DES GSE heatq",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        3
      ]
    },
    {
      "name": "mms2_des_temppara_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS2 FPI/DES electron parallel temperature during this BP",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "eT_para",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS2 FPI2/DES tempPara",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
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