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+.help s2tp Jun99 "Slalib Package"
+.nf
+
+      SUBROUTINE slS2TP (RA, DEC, RAZ, DECZ, XI, ETA, J)
+
+     - - - - -
+      S 2 T P
+     - - - - -
+
+  Projection of spherical coordinates onto tangent plane:
+  "gnomonic" projection - "standard coordinates"
+  (single precision)
+
+  Given:
+     RA,DEC      real  spherical coordinates of point to be projected
+     RAZ,DECZ    real  spherical coordinates of tangent point
+
+  Returned:
+     XI,ETA      real  rectangular coordinates on tangent plane
+     J           int   status:   0 = OK, star on tangent plane
+                                 1 = error, star too far from axis
+                                 2 = error, antistar on tangent plane
+                                 3 = error, antistar too far from axis
+
+  P.T.Wallace   Starlink   18 July 1996
+
+  Copyright (C) 1996 Rutherford Appleton Laboratory
+  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
+
+.fi
+.endhelp