Hello,<div><br></div><div>I am trying to resolve a difference between the SAC versions 101.3b and 101.4.</div><div><br></div><div><u>In 101.3b</u>:</div><div>I am performing "rotate to gcp" on a north and east component seismogram, and writing out the radial and transverse components:</div>
<div><font class="Apple-style-span" face="'courier new', monospace">r s1.dn <a href="http://s1.de">s1.de</a></font></div><div><font class="Apple-style-span" face="'courier new', monospace">rotate to gcp</font></div>
<div> ->If I list the header (lh) at this point, the KCMPNM header value is now empty (ie doesn't show up).</div><div><font class="Apple-style-span" face="'courier new', monospace">write s1.dr s1.dt</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace">quit</font></div><div><br></div><div>If I start sac again, and read in the dr and dt components, they now have the KCMPNM header value, with "Q" for both components.</div>
<div><br></div><div>If I repeat the same procedure in 101.4, the KCMPNM header value remains empty, even after writing the seismograms and reloading them.</div><div>Can anyone confirm whether this is the expected behaviour (ie the difference between the two versions), or what their version is doing?</div>
<div><br></div><div>many thanks,</div><div>Andrew</div>