#define PI   3.14159265358979312
#define HPI  1.57079632679489656
#define RT2  1.41421356237309515
#define CONV 0.01745329
#define D    double
#define F    float

#define RADIUS 6371000.
#define SEAFL  6368000.
#define MOHO   6346600.
#define D670   5701000.
#define CMB    3480000.
#define ICB    1221500.