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2 - 1 
#define	RAD(x)	((x)*PI_180)
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#define	DEG(x)	((x)/PI_180)
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#define ARCSECONDS_PER_RADIAN	(DEG(1)*3600)
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#define input_nybble(infile)    input_nbits(infile,4)
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typedef float	Angle;	/* in radians */
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enum
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{
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	/*
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	 * parameters for plate
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	 */
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	Pppo1	= 0,
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	Pppo2,
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	Pppo3,
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	Pppo4,
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	Pppo5,
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	Pppo6,
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	Pamdx1,
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	Pamdx2,
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	Pamdx3,
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	Pamdx4,
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	Pamdx5,
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	Pamdx6,
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	Pamdx7,
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	Pamdx8,
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	Pamdx9,
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	Pamdx10,
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	Pamdx11,
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	Pamdx12,
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	Pamdx13,
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	Pamdx14,
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	Pamdx15,
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	Pamdx16,
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	Pamdx17,
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	Pamdx18,
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	Pamdx19,
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	Pamdx20,
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	Pamdy1,
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	Pamdy2,
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	Pamdy3,
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	Pamdy4,
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	Pamdy5,
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	Pamdy6,
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	Pamdy7,
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	Pamdy8,
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	Pamdy9,
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	Pamdy10,
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	Pamdy11,
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	Pamdy12,
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	Pamdy13,
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	Pamdy14,
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	Pamdy15,
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	Pamdy16,
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	Pamdy17,
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	Pamdy18,
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	Pamdy19,
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	Pamdy20,
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	Ppltscale,
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	Pxpixelsz,
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	Pypixelsz,
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	Ppltra,
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	Ppltrah,
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	Ppltram,
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	Ppltras,
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	Ppltdec,
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	Ppltdecd,
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	Ppltdecm,
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	Ppltdecs,
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	Pnparam,
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};
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typedef	struct	Plate	Plate;
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struct	Plate
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{
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	char	rgn[7];
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	char	disk;
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	Angle	ra;
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	Angle	dec;
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};
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typedef	struct	Header	Header;
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struct	Header
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{
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	float	param[Pnparam];
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	int	amdflag;
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	float	x;
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	float	y;
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	float	xi;
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	float	eta;
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};
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typedef	long	Type;
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typedef struct	Image	Image;
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struct	Image
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{
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	int	nx;
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	int	ny;	/* ny is the fast-varying dimension */
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	Type	a[1];
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};
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int	nplate;
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Plate	plate[2000];		/* needs to go to 2000 when the north comes */
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double	PI_180;
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double	TWOPI;
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int	debug;
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struct
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{
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	float	min;
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	float	max;
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	float	del;
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	double	gamma;
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	int	neg;
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} gam;
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char*	hms(Angle);
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char*	dms(Angle);
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double	xsqrt(double);
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Angle	dist(Angle, Angle, Angle, Angle);
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Header*	getheader(char*);
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char*	getword(char*, char*);
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void	amdinv(Header*, Angle, Angle, float, float);
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void	ppoinv(Header*, Angle, Angle);
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void	xypos(Header*, Angle, Angle, float, float);
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void	traneqstd(Header*, Angle, Angle);
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Angle	getra(char*);
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Angle	getdec(char*);
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void	getplates(void);
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Image*	dssread(char*);
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void	hinv(Type*, int, int);
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int	input_bit(Biobuf*);
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int	input_nbits(Biobuf*, int);
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void	qtree_decode(Biobuf*, Type*, int, int, int, int);
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void	start_inputing_bits(void);
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Bitmap*	image(Angle, Angle, Angle, Angle);
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int	dogamma(int);