Index: trunk/psModules/src/detrend/pmOverscan.c
===================================================================
--- trunk/psModules/src/detrend/pmOverscan.c	(revision 19846)
+++ trunk/psModules/src/detrend/pmOverscan.c	(revision 21183)
@@ -67,10 +67,10 @@
     psVector *reduced = psVectorAlloc(pixels->n, PS_TYPE_F32); // Overscan for each row
     psVector *ordinate = psVectorAlloc(pixels->n, PS_TYPE_F32); // Ordinate
-    psVector *mask = psVectorAlloc(pixels->n, PS_TYPE_U8); // Mask for fitting
+    psVector *mask = psVectorAlloc(pixels->n, PS_TYPE_VECTOR_MASK); // Mask for fitting
 
     for (int i = 0; i < pixels->n; i++) {
         psVector *values = pixels->data[i]; // Vector with overscan values
         if (values->n > 0) {
-            mask->data.U8[i] = 0;
+            mask->data.PS_TYPE_VECTOR_MASK_DATA[i] = 0;
             ordinate->data.F32[i] = 2.0*(float)i/(float)pixels->n - 1.0; // Scale to [-1,1]
             psVectorStats(myStats, values, NULL, NULL, 0);
@@ -82,5 +82,5 @@
         } else {
             // We'll fit this one out
-            mask->data.U8[i] = 1;
+            mask->data.PS_TYPE_VECTOR_MASK_DATA[i] = 1;
         }
     }