Output Varialjles : 



XLABL Defined previously. 



TT Defined previously. 



WOT Batch number. 



N Ray number for batch NOT. 



MAX Number assigned to a point along a ray path where calculations 



are made. MAX = 1 at the origin point of ray. 



XXX^YYY X,Y co-ordinates for a given MAX. 



ANGLE Angle (degrees) between X-axis and ray, as previously defined 



for A. 

 PCTDIF Percent difference between the value of one of the four 



points to which a plane is fit and that corresponding value 



of the plane (see text, "Interpolation Surfaces"). 

 Variables in Common ; 



S, M Defined previously. 



E Coefficients of the equation of a plane of best-fit to four 



grid points. 



YVW Matrix used in detennining E's. 



CMAT Defined previously. 



C Values of the foiir CMAT values to which a plane is fit. 



XLABL Defined previously. 



D Defined previously. 



TT Defined previously. 



CXY Wave-velocity for a given MAX. 



IT Number of iterations used in obtaining the curvature of a 



wave ray for a given MAX. 

 NG-0 Designates whether a wave ray has moved within one grid unit 



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