rbroad

 RBROAD N1 N2 N3 VSINI EPS METHOD -- Rotationally broadens spectra 

 Parameters:
           
     N1   -- First spectrum to be broadened
     N2   -- Last spectrum to be broadened
     N3   -- First output spectrum
     VSINI-- Vsini of rotational broadening in km/s
     EPS  -- Linear limb darkening coefficient.
     METHOD- F = Fast crude method, which is only accurate if
                 the broadening covers many pixels, otherwise it
                 tends to underbroaden. Just computes profile
                 at each pixel.

             S = Slow accurate method which requires convolving the
                 broadening with the interpolating function for which
                 a truncated SIN(X)/X type interpolation is used.
                 BE WARNED: this can be VERY VERY slow see next.

     If the scale is uniform in velocity, then the routine need only 
     compute the blurring array once and the computation should not 
     be much affected by the METHOD used. Otherwise the blurring array 
     is recomputed for EVERY pixel assuming that the scale is locally 
     a velocity scale according to the disperion at the pixel of interest. 
     This is the reason for the large difference in speeds between the
     two methods for non-uniform in velocity data. I recommend that for
     resonable accuracy and speed you rebin to a uniform velocity scale
     (vbin) with sinc function rebinning, and then use method S, otherwise
     it can take a VERY long time.

     You may notice variations in the time taken on the slow method
     for different broadenings. This is a consequence of the convolution 
     of the rotational profile with the sinc interpolation function. For 
     certain ratios of V sin i/ pixel width the integration routine takes
     longer than normal to converge.

This command belongs to the classes: manipulation and binary .