The first 6 traces aren't in the HEADER and are bad traces. In the header i have the field tracf 1 468(1-468) and the total traces are 474. I revised my data and the 6 first traces aren't bad and kill it with sukill, but I'll put the geometry and I think this will be doing problems, I don't know if i can erase the traces and move the traces to the left.

Thanks for your help!