Data set Version 2.0 : The ROSINA team found corrupted files in the RTOF and DFMS science data V1.0 of this dataset, these corrupted files have been removed in the V2.0. The list of these removed files can be found in the REMOVED_L3_V1_TO_V2.ASC file. Furthermore, the mass scale has been enhanced for a selection of masses which are now provided with 4 digits after the coma (MCP HR neutral spectra for masses 16, 17, 18, 27, 28, 30, 32, 34, 44, 46, 60, and 76) and the offset removal has been improved. As a result, V2.0 of this CODMAC L3 dataset has been created. Some of the CODMAC L2 data with a DATA_QUALITY field set to 0 have been post-processed and re-generated. When bytes of the science data stream were lost by the DPU, it is possible to rebuild the science data by analysing and correcting these anomalies. Another problem originates from the MCP detector readout process: an offset can suddenly be added to the data at any time during the readout; spectra with such an offset have also been corrected using some offset subtraction to cancel this effect. The re-generated PDS files with their original DATA_QUALITY flag are provided in the software zip file containing all the input files used by the software to convert the L2 data into L3 data. Data set Overview : Rosetta was at distances between 320 and 46 km from the comet during this time. ROSINA was permanently analyzing the coma of the comet with all three sensors, except during wheel offloadings when the mass spectrometers DFMS and RTOF were in standby and during orbit control manoeuvers, when all sensors were off. Explanation on the data generation of the ROSINA sensors can be found in the OPERATION_LOGBOOK.ASC. COPS data do not need on-ground calibration and are included in the level 2 dataset. Parameters : DFMS and RTOF data contain neutral gas data as well as ion data. The data are raw, uncalibrated data. COPS data contains nude gauge pressure values of the combined spacecraft and cometary signal. Calibration : The level 3 data products are calibrated with mass scale and intensity. The procedure required to calibrate the RTOF and DFMS data is described in our User manual, Annex D1 (DOCUMENT directory). The ROSINA Team defined quality flags for the data which will then tell the user how well the mass scale and the intensity scale have been defined. Processing : Processing the RTOF and DFMS CODMAC L2 PDS to L3 PDS calibrated data is detailed in the SOFT_RTOF_L2_TO_L3.PDF and SOFT_DFMS_L2_TO_L3.PDF documents. These documents also contain use and installation instructions of the software. Software : Software to convert L2 to L3 data is provided. It produces the calibrated data from the L2 data. Another software is also provided to enhance the mass scale of the DFMS CODMAC L3 products. Media/Format : The standard distribution format for the data is an electronic volume. Coordinate System : The geometry items SC_SUN_POSITION_VECTOR, SC_TARGET_POSITION_VECTOR and SC_TARGET_VELOCITY_VECTOR provided in the label of the data product are relative to the Earth Mean Equator and Equinox reference frame of J2000. SUB_SPACECRAFT_LATITUDE, SUB_SPACECRAFT_LONGITUDE are given in the Cheops reference frame. The SPACECRAFT_ALTITUDE gives the distance to the spacecraft from the target center of mass. These parameters are computed at time t:START_TIME. Distances are given in km, angles in degrees. Cheops Reference Frame : Scholten, F., Preusker, F., Jorda, L, and Hviid, S., Reference Frames and Mapping Schemes of Comet 67P/C-G, RO-C-MULTI-5-67P-SHAPE-V1.0:CHEOPS_REF_FRAME_V1, NASA Planetary Data System and ESA Planetary Science Archive, 2015.

Confidence Level Overview : All data have been validated by the ROSINA team and found as expected. Any exceptions are noted by the DATA_QUALITY field in the label files.