epoch_hsk['VarData'] = None in in https://cdaweb.gsfc.nasa.gov/sp_phys/data/rbsp/rbspa/l2/efw/e-spinfit-mgse/2012/rbspa_efw-l2_e-spinfit-mgse_20120905_v01.cdf; CDF metadata = {'epoch_hsk': {'VarDescription': {'BlockingFactor': 0, 'Compress': 6, 'DataTypeValue': 32, 'DataType': 'CDF_EPOCH16', 'DimSizes': [], 'DimVariances': [], 'LastRecord': -1, 'Num': 4, 'NumDims': 0, 'NumElements': 1, 'PadValue': array([-1.e+31-1.e+31j]), 'RecVariance': True, 'SparseRecords': 'No_sparse', 'VarType': 'zVariable', 'VariableName': 'epoch_hsk'}, 'VarAttributes': {'CATDESC': 'Configuration (HSK) timetags, UTC', 'FIELDNAM': 'Configuration (HSK) timetags, UTC', 'VALIDMIN': (63397987200+0j), 'VALIDMAX': (66301113600+0j), 'FILLVAL': (-1e+31-1e+31j), 'UNITS': 'msec', 'VAR_TYPE': 'support_data', 'SCALETYP': 'linear', 'MONOTON': 'INCREASE', 'LABLAXIS': 'hdr_epoch', 'VAR_NOTES': 'Configuration timetags. Used for BEB and DFB config values.', 'TIME_BASE': '0 AD'}, 'VarData': None}}

Counts based on variable 'epoch_qual' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/rbsp/rbspa/l2/efw/e-spinfit-mgse/2012/rbspa_efw-l2_e-spinfit-mgse_20120905_v01.cdf. The most common cadence, 5000000000000 [ps] = PT5S, occurred for all 17279 timesteps. 

Counts based on variable 'epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/rbsp/rbspa/l2/efw/e-spinfit-mgse/2012/rbspa_efw-l2_e-spinfit-mgse_20120905_v01.cdf. The most common cadence, 11592180000000 [ps] = PT11.59218S, occurred for 0.3779% of the 11 timesteps. 

Counts based on variable 'epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/rbsp/rbspa/l2/efw/e-spinfit-mgse/2019/rbspa_efw-l2_e-spinfit-mgse_20191014_v02.cdf. The most common cadence, 10762356281000 [ps] = PT10.762356S, occurred for 0.2494% of the 11 timesteps. 