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<div class="moz-cite-prefix">On 6/22/2020 2:38 AM, Aiyuan Yang via
Daip wrote:<br>
</div>
<blockquote type="cite"
cite="mid:699F6B51-EE6B-4BA8-AABF-E94003F06F7B@mpifr-bonn.mpg.de">
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<div class="">My question is that do we need to flag the stokes of
“RL” and “LR”, as the there are bad in stokes R? </div>
Thanks a lot!
<div class=""><br class="">
</div>
<div class="">Cheers,</div>
<div class="">Aiyuan</div>
<div class=""><br class="">
</div>
<div class="">
<div>
<blockquote type="cite" class="">
<div class="">On 21 Jun 2020, at 18:16, Aiyuan Yang <<a
href="mailto:ayyang@mpifr-bonn.mpg.de" class=""
moz-do-not-send="true">ayyang@mpifr-bonn.mpg.de</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode:
space; -webkit-line-break: after-white-space;" class="">Dear
AIPS helpdesk staff,
<div class="">
<div class="">Hope this email finds you well. </div>
<div class="">I am new to use AIPS to do calibration
and now I need to flag the bad data using uvflg.</div>
<div class="">But I am confused by the example in the
section 2.2 error recognition of AIPS guidelines,
which said the bad data is antenna 11, IF 2, and
stokes R and the example of flag commands are as
below : </div>
<div class=""><span style="color: rgb(255, 153, 51);
font-family: Courier; font-size: 16px;
font-weight: 700; line-height: 24px; orphans: 2;
text-align: center; widows: 2; background-color:
rgb(255, 255, 255);" class="">"antenna 11 0</span></div>
<inp style="background-color: rgb(255, 255, 255);
font-family: Courier; color: rgb(255, 153, 51);
font-size: 16px; text-align: center; font-weight:
700; line-height: 24px; orphans: 2; widows: 2;"
class="">timerang 0 10 20 20 0 14 0<br class="">
stokes 'rr'<br class="">
bif 2<br class="">
eif 2<br class="">
</inp><span style="font-family: Arial, Helvetica;
font-size: 14px; font-weight: 700; orphans: 2;
widows: 2; background-color: rgb(255, 255, 255);"
class=""></span><inp style="background-color:
rgb(255, 255, 255); font-family: Courier; color:
rgb(255, 153, 51); font-size: 16px; text-align:
center; font-weight: 700; line-height: 24px;
orphans: 2; widows: 2;" class="">inp </inp><span
style="font-family: Arial, Helvetica; font-size:
14px; font-weight: 700; orphans: 2; widows: 2;
background-color: rgb(255, 255, 255);" class="">please
always check your input</span><br
style="font-family: Arial, Helvetica; font-size:
14px; font-weight: 700; orphans: 2; widows: 2;
background-color: rgb(255, 255, 255);" class="">
<inp style="background-color: rgb(255, 255, 255);
font-family: Courier; color: rgb(255, 153, 51);
font-size: 16px; text-align: center; font-weight:
700; line-height: 24px; orphans: 2; widows: 2;"
class="">go"</inp>
<div class="">
<div style="orphans: 2; text-align: center; widows:
2;" class=""><font class="" size="3"
face="Courier" color="#ff9933"><span
style="line-height: 24px; background-color:
rgb(255, 255, 255);" class=""><b class=""><br
class="">
</b></span></font></div>
<div class="">I am wondering why the stokes were
being set to ‘rr’ but the bad stokes is R? </div>
<div class="">So how can I set my flag commands if
my bad data are in stokes R, as shown in the
figure? </div>
<div class=""><span
id="cid:29A18D79-5526-4618-A9D2-C83D8E2F90A4@mpifr-bonn.mpg.de"><PastedGraphic-5.png></span></div>
<div class=""><br class="">
</div>
<div class="">Thank you very much in advance. </div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
<p><br>
</p>
<p>If the R polarization data are in fact bad, then one flags RR,
RL, and LR. The delay solutions you show suggest that something
has gone wrong with the R solutions and you should examine the RR
data closely to see why rather than deleting all your polarization
data and half of the rest. In fact each R solution looks like the
others which means that the delay correction (R(ant 1) - R(ant 2))
would in fact be zero. Something has simply gone wrong so there
may be a much smaller amount of data which could be deleted to fix
this problem - perhaps some channels affected by RFI? POSSM or
SPFLG would be good ways to look at the data to find this issue.</p>
<p>Eric Greisen</p>
<p><br>
</p>
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