ing_id), float32 solar_zenith_angle(sounding_id), float32 sensor_zenith_angle(sounding_id), int8 xco2_quality_flag(sounding_id), int32 xco2_qf_bitflag(sounding_id), uint8 xco2_qf_simple_bitflag(sounding_id), &lt;class &#39;str&#39;&gt; source_files(source_files), uint8 file_index(sounding_id), float32 vertex_latitude(sounding_id,vertices), float32 vertex_longitude(sounding_id,vertices), float32 xco2(sounding_id), float32 xco2_uncertainty(sounding_id), float32 xco2_apriori(sounding_id), float32 pressure_leve