Required Reading : The format of all Alice data are described in detail by the EAICD document located in the /DOCUMENT directory. The Alice team strongly recommends reading this documentation before using the data. Data Set Overview : This data set contains calibrated data acquired by the Rosetta Orbiter ALICE UV Spectrometer during the Rosetta Extension 2 mission phase, which took place between 2016-04-06 and 2016-06-30. Processing : The data in this data set are calibrated, CODMAC Level 3 data. As such, corrections for detector dead time, dark counts, flatfield, and effective area have generally been applied. The primary FITS header contains a list of which corrections have been applied to that file. See the CALIBRATION_COOKBOOK.PDF in the DOCUMENT directory for more information. Data : The data are in FITS format and text format. Each FITS file has a detached PDS label so that they can be read either by FITS or PDS tools. A detailed description of the data format is given in the ALICE EAICD document located in the DOCUMENT directory of this data set. Ancillary Data : No ancillary data included in this data set. 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 frame of J2000. SUB_SPACECRAFT_LATITUDE, SUB_SPACECRAFT_LONGITUDE are given in the Cheops reference frame. These parameters are computed at time t:START_TIME. Distances are given in km, angles in degrees. The 67P/C-G_CK comet frame is defined by the kernel file, ROS_CHURYUMOV_V01.TF. Software : All FITS readers should be able to successfully read the data. Updates for Volume Version 2 : The main changes in volume version 2 are the inclusion of an updated Rosetta-Alice Experiment User Manual and Rosetta-Alice To Planetary Science Archive Interface Control Document.

Confidence Level Overview : Data confidence is nominal, meaning that all data have been validated by the Alice team and found as expected. Any exceptions are noted by the DATA_QUALITY field in the label files. Review : The data have undergone a scientific review and all scientific RID's have been addressed. Data Coverage and Quality : Data quality is good unless otherwise noted by the DATA_QUALITY keyword. Limitations : Although these data have been calibrated and are in physical units, the wavelength scale is unique to each individial file. Thus, care must be taken when comparing one data file to another. The Alice team recommends using the reformatted, calibrated CODMAC level 4 data products, which solves this problem.