This data release provides deep 3D data cubes obtained with the Multi-Unit Spectroscopic Explorer (MUSE) integral field unit, in the wide field mode, from data acquired starting from June - August 2014, plus the initial two periods of MUSE operations, P94 and P95 (September 2014 until September 2015). These deep cubes are now published via the ESO Science Archive as reduced data.

Each deep datacube is combined from observations across OBs. Where multiple visits of the same target exist, with multiple OBs, the deep datacube combines the input files from these OBs with the goal to reach the maximum possible depth of the observations. It then supersedes the already existing OB-based MUSE datacubes. Therefore, the MUSE and the MUSE-DEEP releases are generally complementary. Some of the deep datacubes are produced from slightly more than 120 input files, and the deepest datacubes represent a total integration time of 30 hrs.

The MUSE-DEEP data collection contains 209 deepcubes and their number will grow with time, with future processing cadence being once per period/yearly. The data have been reduced with the MUSE pipeline, version muse -1. 6.1 and higher. The data format for the MUSE-DEEP cubes and their associated information follows the ESO science data products standard for datacubes and is the same as for the OB datacubes.

The MUSE-DEEP cubes tagged "MUSE-DEEP" can be queried and downloaded using the Phase 3 generic query form which provides access to all Phase 3 data, or the Phase 3 spectral data query form with query parameters suited to harvest 3D cube data. More details about the MUSE-DEEP data are available in the associated Phase 3 data release description.