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There are facilities within LEXT to help prepare the parameters for mask manufacture. These are described here, but for a discussion of their use in practice, see the LDSS-2 Observer Manual.
This helps make maximum use of the detector area (which is, in fact, reported as a figure of merit). Several internal parameters, such as MAXSLITLEN, MINYSEP etc., define the limits of this procedure.
Zero-orders are also monitored and are not allowed to overlap with other objects, but are accepted if they impinge only on a sky spectrum. The position of an object within a spectrum is defined by the position of its centre and the internal variable OBJECTEXTENT.
If the /CHECK qualifier is specified then the MASK and BOXES lists are simply checked for possible overlaps, and the results reported. The lists are not modified.
The default is for this routine to delete the box in which the cursor is when depressed. However, for very crowded fields this may get complicated and the /CORNER option means that the bottom left hand corner is used instead.