* further save step size and data source
* count of this rra
*/
- im->gdes[gdi].rpnp[rpi].data = im->gdes[ptr].data;
+ im->gdes[gdi].rpnp[rpi].data = im->gdes[ptr].data + im->gdes[ptr].ds;
im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;