DATA_LAST_UPDATE (type: esriFieldTypeString, alias: Date of the most recent change of the series, SQL Type: sqlTypeOther, length: 10, nullable: true, editable: true)
FREQ_CODE (type: esriFieldTypeString, alias: Frequency of observation (CODE), SQL Type: sqlTypeOther, length: 1, nullable: true, editable: true)
FREQ (type: esriFieldTypeString, alias: Frequency of observation, SQL Type: sqlTypeOther, length: 7, nullable: true, editable: true)