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 BACK N1 N2 PHASE WCEN GAMMA KXLO KXHI NKX KYLO KYHI NKY C1 C2 -- Back 
                        projects spectra

 This computes integrals over sinusoidal paths through the data and plots
 the results as an image in which the intensity at each point is the value 
 of the integral. The integral is carried out NKX*NKY times so it is best
 to start with low values to get an idea of the result. In order to get
 a filtered back-projection you should run BCKFIL first.

 Parameters:
            N1   -- First spectrum
            N2   -- Last spectrum
            PHASE-- Name of phase to use
            WCEN -- Rest wavelength
            GAMMA-- Systemic velocity
            KXLO -- Lowest Kx value
            KXHI -- Highest Kx value
            NKX  -- Number of Kx values
            KYLO -- Lowest Ky value
            KYHI -- Highest Ky value
            NKY  -- Number of Ky values
            C1   -- Plot level for lowest colour index
            C2   -- Plot level for highest colour index

            Set C1=C2 for auto-scaling from lowest to highest
            values. If C1=C2=0. they will be set to the 
            autoscaled values on leaving the routine.
            Otherwise they will be left alone.


 If you choose NKX and NKY to be large, there may only be enough memory
 to plot the image in sections, in which case the autoscaling option
 only scales on the first chunk to be plotted.

This command belongs to the class: binary