Index: trunk/ppStack/src/ppStackArguments.c
===================================================================
--- trunk/ppStack/src/ppStackArguments.c	(revision 18770)
+++ trunk/ppStack/src/ppStackArguments.c	(revision 18785)
@@ -147,10 +147,10 @@
     psMetadataAddF32(arguments, PS_LIST_TAIL, "-threshold-mask", 0, "Threshold for mask deconvolution", NAN);
     psMetadataAddF32(arguments, PS_LIST_TAIL, "-image-rej", 0, "Pixel rejection fraction threshold for rejecting entire image", NAN);
-    psMetadataAddS32(arguments, PS_LIST_TAIL, "-rows", 0, "Rows to read at once", 128);
+    psMetadataAddS32(arguments, PS_LIST_TAIL, "-rows", 0, "Rows to read at once", 0);
     psMetadataAddBool(arguments, PS_LIST_TAIL, "-photometry", 0, "Do photometry on stacked image?", false);
-    psMetadataAddS32(arguments, PS_LIST_TAIL, "-psf-instances", 0, "Number of instances for PSF generation", 5);
-    psMetadataAddF32(arguments, PS_LIST_TAIL, "-psf-radius", 0, "Radius for PSF generation", 20.0);
+    psMetadataAddS32(arguments, PS_LIST_TAIL, "-psf-instances", 0, "Number of instances for PSF generation", 0);
+    psMetadataAddF32(arguments, PS_LIST_TAIL, "-psf-radius", 0, "Radius for PSF generation", NAN);
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-psf-model", 0, "Model name for PSF generation", "PS_MODEL_RGAUSS");
-    psMetadataAddS32(arguments, PS_LIST_TAIL, "-psf-order", 0, "Spatial order for PSF generation", 3);
+    psMetadataAddS32(arguments, PS_LIST_TAIL, "-psf-order", 0, "Spatial order for PSF generation", 0);
     psMetadataAddBool(arguments, PS_LIST_TAIL, "-variance", 0, "Use variance for rejection?", false);
     psMetadataAddBool(arguments, PS_LIST_TAIL, "-safe", 0, "Play safe with small numbers of pixels to combine?", false);