Index: trunk/ppSim/src/ppSimInsertStars.c
===================================================================
--- trunk/ppSim/src/ppSimInsertStars.c	(revision 21365)
+++ trunk/ppSim/src/ppSimInsertStars.c	(revision 26900)
@@ -26,4 +26,5 @@
     float expTime   = psMetadataLookupF32(NULL, recipe, "EXPTIME"); // Exposure time
     float darkRate  = psMetadataLookupF32(NULL, recipe, "DARK.RATE"); // Dark rate
+    float nSigmaLim = psMetadataLookupF32(NULL, recipe, "STARS.SIGMA.LIM"); // significance of faintest stars
 
     float readnoise = psMetadataLookupF32(NULL, cell->concepts, "CELL.READNOISE");// CCD read noise, e
@@ -106,6 +107,5 @@
         pmModelSetFlux (model, flux);
 
-        // XXX let the flux limit be a user-defined number of sky sigmas (not just 1.0)
-        float radius = model->modelRadius (model->params, roughNoise);
+        float radius = model->modelRadius (model->params, nSigmaLim * roughNoise);
         radius = PS_MAX (radius, 1.0);