repair Nicos read-in

Device/IO/ReadWriteNicos.cpp

@@ -139,9 +139,6 @@ Datafield* Util::RW::readNicos(std::istream& input_stream)
                                  lineNumber));
 
         for (unsigned col = 0; col < width; ++col) {
-            const size_t global_index = result->frame().toGlobalIndex(
-                {col, height - 1 - dataRow}); // y-axis "0" is at bottom => invert y
-                                              // to show first line at top of image
 
             int value = 0;
             if (!Base::String::to_int(valuesAsString[col], &value))
@@ -149,7 +146,9 @@ Datafield* Util::RW::readNicos(std::istream& input_stream)
                     "Value '" + valuesAsString[col] + "' could not be converted to integer",
                     lineNumber));
 
-            (*result)[global_index] = value;
+            // y-axis "0" is at bottom => invert y
+            // to show first line at top of image
+            (*result)[(height - 1 - dataRow) * width + col] = value;
         }
         dataRow++;