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diff --git a/noao/digiphot/apphot/polyphot/apyinit.x b/noao/digiphot/apphot/polyphot/apyinit.x
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+include "../lib/apphotdef.h"
+include "../lib/polyphotdef.h"
+
+# AP_YINIT - Initialize the polyphot structure.
+
+procedure ap_yinit (ap, cfunction, cbox, sfunction, annulus, dannulus, fwhmpsf,
+    noise)
+
+pointer	ap		# pointer to the apphot structure
+int	cfunction	# centering algorithm
+real	cbox		# centering box half-width
+int	sfunction	# sky fitting algorithm
+real	annulus		# inner radius of sky annulus
+real	dannulus	# width of sky annulus
+real	fwhmpsf		# fwhmpsf
+int	noise		# Noise function
+
+begin
+	call malloc (ap, LEN_APSTRUCT, TY_STRUCT)
+
+	# Set the global apphot package parameters.
+	call ap_defsetup (ap, fwhmpsf)
+
+	# Setup noise parameters.
+	call ap_noisesetup (ap, noise)
+
+	# Set display options.
+	call ap_dispsetup (ap)
+
+	# Setup the centering parameters.
+	call ap_ctrsetup (ap, cfunction, cbox)
+
+	# Set up the sky fitting parameters.
+	call ap_skysetup (ap, sfunction, annulus, dannulus)
+
+	# Setup the polyphot parameters.
+	call ap_ysetup (ap)
+
+	# Set unused structure pointers to null.
+	AP_PPSF(ap) = NULL
+	AP_PPHOT(ap) = NULL
+	AP_RPROF(ap) = NULL
+end
+
+
+# AP_YSETUP -- Procedure to set parameters for polygonal aperture  photometry.
+
+procedure ap_ysetup (ap)
+
+pointer	ap		# pointer to apphot strucuture
+
+pointer	ply
+
+begin
+	call malloc (AP_POLY(ap), LEN_PYSTRUCT, TY_STRUCT)
+	ply = AP_POLY(ap)
+	AP_PYCX(ply) = INDEFR
+	AP_PYCY(ply) = INDEFR
+	AP_PYX(ply) = INDEFR
+	AP_PYY(ply) = INDEFR
+	AP_PYZMAG(ply) = DEF_PYZMAG
+	AP_PYNAME(ply) = EOS
+	AP_PYROOT(ply) = EOS
+end