Plotting

To plot Stokes values, a selector object must be created and the set_polarisation function used to select the desired polarisation products.

The values which can be plotted include a selection of [I,Q,U,V], [I, Plinear, Pangle, V], [RR, LL] or [XX, YY, Real(XY), Imaginary(XY)]. (Plinear and Pangle are the percentage and position angle of linear polarisation).

Example:

  ASAP>selection = selector()

  ASAP>selection.set_polarisations(``I Q U V'')
  ASAP  plotter.set_selection(selection);              # Select I, Q, U \& V

  ASAP>selection.set_polarisations(``I Q'')
  ASAP  plotter.set_selection(selection);              # Select just I \& Q

  ASAP>selection.set_polarisations(``RR LL'')
  ASAP  plotter.set_selection(selection);              # Select just RR \& LL

  ASAP>selection.set_polarisations(``XX YY'')
  ASAP  plotter.set_selection(selection);              # Select linears

  ASAP>selection.set_polarisations(``I Plinear'')
  ASAP  plotter.set_selection(selection);              # Fractional linear

  ASAP>selection.set_polarisations(``Pangle'')
  ASAP  plotter.set_selection(selection);              # Position angle

Scan, beam and IF selection are also available in the selector object as describe in section .