#define STRLEN 80
#define DEFDATFLNM "/d/foster/uars/hrdi/hrdi154.dat"
#define DEFGCMFLNM "/d/foster/timesdat/TUARB1.ut00.cdf"
#define IBORB 1
#define IEORB 999
#define MXPORB 100
#define IPLCON 1
#define IPLVEC 1
#define SPVAL   1.e36
#define INTERPSLT 1	/* default is to interpolate to sat slt */

typedef struct {
  float ut;
  float glat;
  float glon;
  float sza;
  float slt;
  float *un;
  float *vn;
} Dat_struct;

extern int nrec,nalt;
extern float *alt;