Using KAPPA programs to analyze (inclinometry) data for sinusoidal components
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0. >kappa

1. From ascii data files with (eg) azimuth in column 1 and (eg) tilt in 
   column 2 . . .

2. . . run (the kappa program) TRANDAT 
   eg trandat in.txt out poscols=1 valcol=2 pscale=0.2

   This generates a NDF (.sdf) file (out.sdf) with resolution 0.2 units 
   (in azimuth). Note the number of points in the file (npts).

3. Running HDSTRACE on the file 'out' should reveal the internal 
   structure, and running LINPLOT :
   linplot out (xleft=xmin xright=xmax ybot=ymin ytop=ymax) 
   should confirm the input data.

4. Run FOURIER :
      fourier out powerout=outpower hermout=outherm
   puts the power spectrum in the file outpower.sdf

5. linplot outpower 
   (with suitable scale & margin controls : xleft= xright= ybot= ytop=)
   should reveal the frequency spectrum. It is a reflection about the
   centre : ignore the right half.

6. Use cursor to locate the peaks, p_i, in the left half.

7. To convert the location of the peaks, p_i, back to 
   'wavelengths', w_i, in the original (azimuth) units :

          w_i = npts*pscale / (npts/2 - p_i)