Index: trunk/ppSim/src/ppSimArguments.c
===================================================================
--- trunk/ppSim/src/ppSimArguments.c	(revision 29011)
+++ trunk/ppSim/src/ppSimArguments.c	(revision 30618)
@@ -49,4 +49,6 @@
     psMetadataAddF32(arguments,  PS_LIST_TAIL, "-zp", 0, "Photometric zero point", NAN);
     psMetadataAddF32(arguments,  PS_LIST_TAIL, "-seeing", 0, "Seeing FWHM (arcsec)", NAN);
+    psMetadataAddF32(arguments,  PS_LIST_TAIL, "-seeing-max", 0, "Seeing FWHM (arcsec) at end of ramp", NAN);
+    psMetadataAddBool(arguments,  PS_LIST_TAIL, "-seeing-ramp", 0, "Use a seeing ramp", false);
     psMetadataAddF32(arguments,  PS_LIST_TAIL, "-starslum", 0, "Fake star luminosity function slope", NAN);
     psMetadataAddF32(arguments,  PS_LIST_TAIL, "-starsmag", 0, "Brightest magnitude for fake stars", NAN);
@@ -130,4 +132,6 @@
 	// 'seeing' is not required: we can load a psf-model instead; but if not, it is allowed
         ppSimArgToRecipeF32(&status, options, "SEEING", arguments, "-seeing"); // seeing (FWHM in arcsec)
+        ppSimArgToRecipeF32(&status, options, "SEEING.MAX", arguments, "-seeing-max"); // seeing (FWHM in arcsec)
+        ppSimArgToRecipeBool(&status, options, "SEEING.RAMP", arguments, "-seeing-ramp"); // seeing (FWHM in arcsec)
 
 	// 'scale' is not required: we can use the WCS instead; but if not, it is allowed
@@ -227,4 +231,10 @@
         psMetadataAddF32(options, PS_LIST_TAIL, "PA", 0, "Boresight position angle (radians)",pa * M_PI / 180.0);
 
+        if (psMetadataLookupBool(NULL, arguments, "-seeing-ramp")) {
+	    float seeingMax = psMetadataLookupF32(NULL, arguments, "-seeing-max"); // seeing at ramp end
+	    psMetadataAddF32(options, PS_LIST_TAIL, "SEEING.MAX", 0, "Seeing FWHM (arcsec)", seeingMax);
+	    psMetadataAddBool(options, PS_LIST_TAIL, "SEEING.RAMP", 0, "use seeing ramp", true);
+	}
+
         ppSimArgToRecipeF32(&status, options, "ZEROPOINT", arguments, "-zp"); // Zero point
     }