# Number of variables to be fit.
define	NV		4

# The V2,V3 coordinates and X,Y coordinates may have the same parity
# or the opposite parity; the latter means that the X coordinates are
# "flipped", e.g. changed in sign.  These two macros are the possible
# values for the parity parameter in fitxy and evalxy.
define	XY_SAME		1
define	XY_OPPOSITE	2

# These define the coefficients of fit.
define	COS_ANGLE	$1[1]		# scale * cos (angle)
define	SIN_ANGLE	$1[2]		# scale * sin (angle)
define	V2_ZERO		$1[3]		# V2_0
define	V3_ZERO		$1[4]		# V3_0