1. Selection by product number (mode v):

In the following examples, the letters refer to the type of display. viz.

• l - The lag spectrum, i.e. correlation function.
• a - The amplitude of the frequency spectrum.
• r - The real part of the frequency spectrum.
• i - The imaginary part of the frequency spectrum.
• p - The phase of the frequency spectrum.
• d - The amplitude difference of the frequency spectrum, using a previously stored reference.
• q - The amplitude quotient of the frequency spectrum, using a previously stored reference. This removes the bandpass shape, allowing easier identification of weak line features.

The numbers refer to the product numbers in the order they appear in the correlator configuration.

Examples:
$>$ select l1 a1 - displays lag and frequency spectra of product 1 on separate plot panels.
$>$ select a1&2 - displays frequency spectrum of products 1 & 2 on one plot panel.
$>$ select a1&2 a3&4 - displays frequency spectra in two panels, each containing two products.
$>$ select a2-1 - displays the difference frequency spectrum between two products.
$>$ select 1-2 4+5 - displays difference and sum frequency spectra in two panels, using the global display type (see below).

Special Multibeam Selection:
>select mbN - displays lag or frequency spectra of N beams, two polarisations per plot panel, in the multibeam layout.