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+.help asifit Dec98 "Image Interpolator Package"
+.ih
+NAME
+asifit - fit the interpolant to data
+.ih
+SYNOPSIS
+asifit (asi, datain, npix)
+
+.nf
+    pointer	asi		#I interpolant descriptor
+    real	datain[npix]	#I input data
+    int		npix		#I the number of data points
+.fi
+.ih
+ARGUMENTS
+.ls asi   
+Pointer to sequential interpolant descriptor structure.
+.le
+.ls datain
+Array of input data.
+.le
+.ls npix    
+Number of data points.
+.le
+.ih
+DESCRIPTION
+The datain array is checked for size, memory is allocated for the coefficient
+array, and the end conditions are specified.  The interior polynomial, sinc and
+drizzle interpolants are saved as the data points. The polynomial coefficients
+are calculated directly from the data points in the evaluation stage. The
+B-spline coefficients are calculated in ASIFIT as they depend on the entire
+data array. 
+.ih
+NOTES
+Checking for INDEF valued and out of bounds pixels is the responsibility
+of the user. ASIINIT or ASISINIT and ASIFIT must be called before using
+ASIEVAL, ASIVECTOR, ASIDER or ASIGRL.
+.ih
+SEE ALSO
+.endhelp