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Display individual spectra in a Map-like display (one per box, placed at their respective positions) from a 3-D SIC variable, assumed to be in the LMV order.
Control parameters: The displayed region and sampling are controlled by variables CENTER and SIZE, and the 3-elements arrays XPIX and YPIX. XPIX[3] gives the stpe (in pixels) between displayed spectra in X (resp in Y); if 0, a default step is guessed from the angular resolution and pixel size. CENTER and SIZE select the displayed region. If zero, XPIX[1:2] give the first and last pixels along X (resp Y). If still zero, the inner quarter is displayed.
RANGE indicate the displayed velocity range. The spectra scale can be controlled by string BOX_LIMITS.
Note: the second argument may be omitted to re-display the same dataset with different control parameters. SHOW SPECTRA is however not fully protected against changes in the data set between two invocations, so this should only be used for consecutive commands.