Index: trunk/psModules/src/objects/pmPSFtryModel.c
===================================================================
--- trunk/psModules/src/objects/pmPSFtryModel.c	(revision 36123)
+++ trunk/psModules/src/objects/pmPSFtryModel.c	(revision 36623)
@@ -36,4 +36,5 @@
 #include "pmSourceDiffStats.h"
 #include "pmSourceSatstar.h"
+#include "pmSourceLensing.h"
 #include "pmSource.h"
 #include "pmSourceFitModel.h"
@@ -111,10 +112,19 @@
 
     // set the max order (0 = constant) which the number of psf stars can support:
+    int MaxOrderForStars = 0;
+
+    // we require only 3 stars for n = 0, increase stars / cell for higher order
+    if (sources->n >=  16) MaxOrderForStars = 1; //  4 cells, 4 per cell
+    if (sources->n >=  54) MaxOrderForStars = 2; //  9 cells, 6 per cell
+    if (sources->n >= 128) MaxOrderForStars = 3; // 16 cells, 8 per cell
+    if (sources->n >= 300) MaxOrderForStars = 4; // 25 cells, 12 per cell
+    if (sources->n >  576) MaxOrderForStars = 5; // 36 cells, 16 per cell
+
     // rule of thumb: require 3 stars per 'cell' (order+1)^2
-    int MaxOrderForStars = 0;
-    if (sources->n >= 12) MaxOrderForStars = 1; // 4 cells
-    if (sources->n >= 27) MaxOrderForStars = 2; // 9 cells
-    if (sources->n >= 48) MaxOrderForStars = 3; // 16 cells
-    if (sources->n >  75) MaxOrderForStars = 4; // 25 cells
+    // if (sources->n >= 12) MaxOrderForStars = 1; // 4 cells
+    // if (sources->n >= 27) MaxOrderForStars = 2; // 9 cells
+    // if (sources->n >= 48) MaxOrderForStars = 3; // 16 cells
+    // if (sources->n >= 75) MaxOrderForStars = 4; // 25 cells
+    // if (sources->n > 108) MaxOrderForStars = 5; // 36 cells
 
     int orderMax = PS_MAX (options->psfTrendNx, options->psfTrendNy);