MS plugin: fixed a bug in calculation of the motor positions in txt files.

plugins/Multiscale_Coords.ijm

@@ -409,7 +409,7 @@ while(repeatFlag == 1) {
     }
     //Y position of each of the other volumes in stage coords
     for (l = 1; l<ScansInY[0]; l++) {
-      centresYreal[l] = centresYreal[l-1] - ScansInY[1];
+      centresYreal[l] = centresYreal[l-1] + ScansInY[1];
       if (abs(centresYreal[l]) < 0.001) {centresYreal[l] = 0;} //avoid extremely low exponential values
     }