#define	EVAL_WINDOW		4
#define	EVAL_STEP		1
#define MAX_DATA		10

#ifndef	M_PI
#  define M_PI          3.14159265358979323846
#  define M_PI_2        1.57079632679489661923
#  define M_PI_4        0.78539816339744830962
#  define M_1_PI        0.31830988618379067154
#  define M_2_PI        0.63661977236758134308
#  define M_2_SQRTPI    1.12837916709551257390
#endif
#  define _2_M_PI	6.2831853072

extern	int			tid;
extern	double *	data[EVAL_WINDOW];
extern	char		tdata[MAX_DATA];
extern	int			did;
extern	size_t 		sz_data;

int 	init_data(void);
int		out_data(int NumLines,int PutTime,int PutPolar);
int 	flush_data(void);
int		get_data(float time);