Although by adequate use of transpositions, you can produce velocity-position plots from data cubes, it is also possible to create a 2-D image for processing by GILDAS to produce Velocity-Position plots by using command STRIP . This command works on the current index, which must correspond to a real strip. Relevant information is written to a 2-D image which can later be processed by GILDAS . The first axis corresponds to the current X unit (Velocity or Frequency or Channels) and the second axis to the offset.