fixed a bug in SLM_simple velo plotting

flash2d/src/options-sphere/SLM_simple_stacked.f90

@@ -197,8 +197,8 @@
 
 !-SLM--------- put alpha values to u and v field entries
 
-      i_start= i_layerid-1
-      i_uvpointer = (/ (i_start+i_cnt, i_cnt=1,GRID_dimension) /)
+      i_start= i_stcuv+ i_layerid-1
+      i_uvpointer = (/ ((i_start+i_cnt), i_cnt=1,GRID_dimension) /)
       r_alpha= -r_alpha
       IF(present(i_newsdepth)) THEN
         CALL grid_putinfo(p_ghand(i_timeplus), r_nodevalues=r_alpha(1:GRID_dimension,:), &