Function:     CONPVARS

Purpose:      Determine parameters of 2d-gaussian needed to convolve
              'oldbeam' to 'newbeam'

Files:        convpars.shl

Author:       M. Vogelaar

Category:     CONVOLUTION

Use:          INTEGER CONVPARS( oldbeam, I     REAL ARRAY
                                newbeam, I     REAL ARRAY
                                phiold,  I     REAL
                                phinew,  I     REAL
                                conbeam, O     REAL ARRAY 
                                phicon   O     REAL )

Description:  Note that all angles are in DEGREES and wrt. pos. X-axis!
              Conv. beam values can be calculated with formulas given by 
              J. P. Wild in Aust. J. Phys.,1970,23,113-115
              A distribution (F2) is convolved with a gaussian (F1) and the 
              result is a new distribution (F0). For the distributions we can 
              write: F0 = F1*F2 (where * denotes a 2-dim convolution).
              This function finds the beam and angle of F1.
              In what follows a and b denote the major and minor SEMI-axes 
              and 'th' is the angle of the major axis with the positive 
              X-axis. 

Notes:        All angles are in DEGREES and wrt. pos. X-axis! 

Updates:      Sep 10, MV, Document created