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-rw-r--r--src/patch/coords.hh8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/patch/coords.hh b/src/patch/coords.hh
index f01c482..0966108 100644
--- a/src/patch/coords.hh
+++ b/src/patch/coords.hh
@@ -47,6 +47,14 @@
// throughout the patch
// tau the third member of (mu,nu,phi) (the one which
// is neither rho nor sigma)
+// (px,py) plotting coordinates, defined in terms of (mu,nu,phi)
+// see "patch.hh" for details
+//
+// We also use prefixes on coordinates, eg.
+// irho integer grid coordinate
+// rho floating point angular coordinate, measured in radians
+// drho floating point angular coordinate, measured in degrees
+// I/O uses the degree coordinates in preference to radian ones.
//
//*****************************************************************************