extern int otb_6s_splin2_(
  otb_6s_doublereal *x1a,
  otb_6s_doublereal *x2a,
  otb_6s_doublereal *ya,
  otb_6s_doublereal *y2a,
  otb_6s_integer *m,
  otb_6s_integer *n,
  otb_6s_doublereal *x1,
  otb_6s_doublereal *x2,
  otb_6s_doublereal *y
  );
