MESSENGER E/V/H MASCS 4 UVVS/VIRS
                                     DERIVED DATA V1.0
Abstract ======== This data set consists of the MESSENGER MASCS UVVS+VIRS combined derived data records, also known as DDRs. The UVVS+VIRS DDRs consist of derived data from UVVS' middle ultraviolet (MUV) photomultiplier tube, and VIRS. Spatially proximate UVVS and VIRS spectra are combined to create a single extended …