<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Dear Eric,</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>I hope you are fine and I also hope you can help me, please. I'm running into a problem I do not fully understand .</div><div><br></div><div>I try to model a visibility set for a GMRT dataset using UVSUB.</div><div><br></div><div>Now this is what I have done. </div><div><br></div><div>1. I have replaced all the real and imaginary values of the visibilities to zero (doing all channels).</div><div>2. than I have add ONE point source at the phase centre to it, by using UVSUB (7.33473 Jy, DFT,factor -1 ).</div><div><br></div><div>So far so good. Now if I have a look into the visibilities e.g. amplitude versus time, some of the </div><div>baselines show a rather strange amplitude behaviour always at the end of the last scan (e.g. 1-29, 1-30). </div><div>It seems that the flux shouting up. Now the source is above 45 elevation so not sure what causes this jump in amplitude.</div><div><br></div><div>Could that be related to some smoothing etc. ?</div><div><br></div><div>I have attached 2 files:</div><div><br></div><div>Amplitude versus time plot</div><div>JJJ_MODEL_AMP_I.ps_pages file </div><div><br></div><div>Model visibilities for antenna 1 </div><div>JJJ.FITS</div><div><br></div><div>I hope you might have an idea.</div><div><br></div><div>cheers and thanks for hopefully considering to have a look into it.</div><div><br></div><div>Hans</div><div><br></div><div><br></div><div></div></body></html>