Hi Erdi - It looks like you applied a general AGC to your data (beforetopmute.png).  This seems to make amplitudes about equal in the noise before the first breaks and in the real data.  I suggest you first process the data in some way to reduce the amplitudes of the noise before the first breaks.  I have found two simple ways to do this. One way is to use the "perc" value (perc=99") in suxwigb, but I don't think that helps you because you need the output after applying "perc" and suxwigb is a dead-end process. The other way is to use sugain with "tpow=2".  If this is effective in diminishing the noise before the first break, I would output those gathers as my second dataset.  With the second dataset, my next step would be, trace-by-trace, search down for some threshold value (basically, the first break), then back up maybe 8 or 10 or 12 ms, then zero all values earlier than that time.  Be sure you don't try to zero amplitudes before zero time (!). Regards,David Forel . . . . . . . . . . . . . . On Sunday, August 11, 2024 at 03:39:04 PM MDT, Gerhard Diephuis <gdiephuis(a)xs4all.nl> wrote: Erdi, good evening   In my mind the most logical would be to define an offset dependent top mute. Obviously you are dependent on that particular trace header – just plotting a reasonable number of traces with offset values as horizontal annotations should give an idea whether you can progress in that vein. Otherwise the route becomes cumbersome…….   Good luck   Gerhard   From: Erdi Apatay <eapatay(a)mtu.edu> Date: Sunday, 11 August 2024 at 18:03 To: SU-users <seisunix(a)mailman.seismic-unix.org> Subject: [Seisunix] Top Mute   Hi all!   I have real seismic data and I want to apply top mute to this data. Actually, I can apply top mute to shot gathers one by one, but I wanted to create a script that could apply top mute to all of them, but I could not get a good result. Do I need to create a script that includes a loop to do this properly? What path should I follow?   I would be happy if you could help Best Erdi   P.S.: I attached a script I wrote ( I tried to do top mute only for the right upper side of the shot gathers for testing), and how they look after applying my script, and output of surange command.   _______________________________________________ Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org _______________________________________________ Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org