This data set was acquired with a Sippican T-5 XBT Expendable Probe during Marcus G. Langseth expedition MGL1307 conducted in 2013 (Chief Scientist: Dr. Dale Sawyer). These data files are of Sippican MK21 Export Data File format and include Temperature and Sound Velocity data that have not been processed. Data were acquired as part of the project(s): Seismic Study of the Galicia S Detachment and Two-Ship seismic experiment: OBS instruments tended by F.S. Poseidon, airguns fired from R/V Marcus G. Langseth., and funding was provided by NSF grant(s): OCE10-30650 and OCE10-31769.