Here one selects which baseline of a spectrometer shall be used. Note that this baseline selection is not needed for 3-way combination, since the three NPOI baseline E-W, C-W, and C-E are in spectrometers 1, 2, and 3, respectively.

The baseline selection is only used if the directive is set to "Selected". Important: after entering a selection, do not forget to hit <return>!

There is a simple parser reading the input selection. The following examples should explain how it works.