Summary of Data Quality Observations of 19/12/96 ----------------------------------------------- This report was generated on 22 December 1996 Array: 0.210 Fields: Calibrator 1934-638 Offset Calibrator 1934_a Blank Field 1934_b Frequencies: 1384 2368 4800 8640 MHz The offset calibrator field was offset in RA,DEC from 1934-638 by 0,420 arcsec at 1384 MHz 0,420 arcsec at 2368 MHz 0,120 arcsec at 4800 MHz 0,120 arcsec at 8640 MHz Cloce to two and a half hours were lost in the middle of this observation while maintenance tasks were carried out. See the end of this document for an explanation of terms and the filenaming convention. See http://wwwnar.atnf.csiro.au/www/operations/dqo/dqo.html for information on the DQO program. ======================================================================== Visibility-based statistics --------------------------- Total observing time is 8.85 hours Flagging statistics after ATLOD ------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384 8.0% 8.0% 7.9% 7.9% 7.9% 8.5% 7.9% 1934-638.2368 0.2% 0.1% 0.1% 0.5% 0.1% 0.3% 0.1% 1934-638.4800 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1934-638.8640 0.2% 0.1% 0.1% 0.1% 0.1% 0.1% 0.5% 1934_a.1384 7.8% 7.7% 7.7% 7.9% 7.7% 7.7% 7.7% 1934_a.2368 0.1% 0.1% 0.1% 0.1% 0.1% 0.4% 0.1% 1934_a.4800 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1934_a.8640 0.1% 0.0% 0.2% 0.0% 0.0% 0.0% 0.0% 1934_b.1384 8.3% 8.2% 8.3% 8.1% 8.1% 8.5% 8.4% 1934_b.2368 0.4% 0.2% 0.4% 0.5% 0.4% 0.4% 0.4% 1934_b.4800 0.3% 0.5% 0.2% 0.2% 0.3% 0.2% 0.3% 1934_b.8640 0.1% 0.1% 0.1% 0.1% 0.1% 0.4% 0.1% ---------------------------------------------- Closure phase statistics for the point sources ---------------------------------------------- File Th.Phase Sigmas ---- -------- ------ 1934-638.1384 0.013 40.92 1934-638.2368 0.018 11.00 1934-638.4800 0.031 1.39 1934-638.8640 0.062 1.48 1934_a.1384 0.013 33.38 1934_a.2368 0.022 8.23 1934_a.4800 0.032 1.62 1934_a.8640 0.081 1.53 --------------------------------------- Post-reduction flagging statistics ---------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384-cal 21.5% 22.6% 25.6% 18.8% 22.0% 19.7% 20.4% 1934-638.2368-cal 9.2% 13.8% 8.7% 6.8% 11.0% 7.9% 7.1% 1934-638.4800-cal 5.1% 4.7% 4.5% 4.1% 6.4% 4.5% 6.2% 1934-638.8640-cal 5.0% 5.4% 5.0% 3.9% 3.8% 5.5% 6.2% 1934_a.1384-cal 12.5% 12.4% 16.2% 10.8% 12.3% 12.8% 10.5% 1934_a.2368-cal 0.2% 0.1% 0.3% 0.1% 0.1% 0.4% 0.2% 1934_a.4800-cal 3.5% 3.6% 5.1% 3.6% 1.5% 2.3% 4.9% 1934_a.8640-cal 1.5% 2.6% 1.1% 0.7% 2.3% 0.7% 1.4% 1934_b.1384-cal 12.7% 13.5% 12.8% 14.5% 13.4% 11.7% 10.3% 1934_b.2368-cal 4.1% 4.6% 4.8% 5.1% 4.2% 2.4% 3.6% 1934_b.4800-cal 4.0% 4.1% 5.5% 2.6% 3.8% 5.5% 2.6% 1934_b.8640-cal 1.9% 1.7% 1.8% 1.9% 1.8% 2.1% 2.4% ======================================================================== Image-based statistics ---------------------- File Th. RMS Sigmas D.R. Pk Val ---- ------- ------ ---- ------ 1934-638.1384.icln 1.42E-04 13.67 7667 14.941 1934-638.1384.qmap 1.42E-04 10.10 0.007 1934-638.1384.umap 1.42E-04 11.23 0.008 1934-638.1384.vmap 1.42E-04 7.61 0.005 1934-638.2368.icln 1.57E-04 17.34 4253 11.557 1934-638.2368.qmap 1.57E-04 5.82 0.005 1934-638.2368.umap 1.57E-04 5.47 0.005 1934-638.2368.vmap 1.57E-04 3.86 0.003 1934-638.4800.icln 1.01E-04 7.24 7980 5.825 1934-638.4800.qmap 1.01E-04 2.29 0.002 1934-638.4800.umap 1.01E-04 2.05 0.001 1934-638.4800.vmap 1.01E-04 1.91 0.002 1934-638.8640.icln 1.06E-04 3.50 7682 2.838 1934-638.8640.qmap 1.06E-04 1.52 0.001 1934-638.8640.umap 1.06E-04 1.48 0.001 1934-638.8640.vmap 1.06E-04 1.40 0.001 1934_a.1384.icln 1.37E-04 15.70 6090 13.112 1934_a.1384.qmap 1.37E-04 11.91 0.010 1934_a.1384.umap 1.37E-04 11.68 0.008 1934_a.1384.vmap 1.37E-04 6.80 0.005 1934_a.2368.icln 1.49E-04 14.99 3755 8.389 1934_a.2368.qmap 1.49E-04 63.09 19 0.181 1934_a.2368.umap 1.49E-04 40.95 18 0.110 1934_a.2368.vmap 1.49E-04 35.99 13 0.069 1934_a.4800.icln 1.24E-04 7.02 6067 5.264 1934_a.4800.qmap 1.24E-04 3.20 20 0.008 1934_a.4800.umap 1.24E-04 2.22 0.002 1934_a.4800.vmap 1.24E-04 1.83 0.002 1934_a.8640.icln 1.29E-04 3.22 5040 2.096 1934_a.8640.qmap 1.29E-04 14.99 17 0.032 1934_a.8640.umap 1.29E-04 9.86 11 0.014 1934_a.8640.vmap 1.29E-04 12.10 11 0.017 1934_b.1384.imap 1.32E-04 16.76 0.020 1934_b.1384.qmap 1.32E-04 14.45 0.007 1934_b.1384.umap 1.32E-04 13.32 0.008 1934_b.1384.vmap 1.32E-04 8.08 0.004 1934_b.2368.imap 1.48E-04 2.67 13 0.005 1934_b.2368.qmap 1.48E-04 2.00 0.001 1934_b.2368.umap 1.48E-04 1.68 0.001 1934_b.2368.vmap 1.48E-04 1.30 0.001 1934_b.4800.imap 1.22E-04 1.09 0.001 1934_b.4800.qmap 1.22E-04 0.97 0.001 1934_b.4800.umap 1.22E-04 1.01 0.001 1934_b.4800.vmap 1.22E-04 0.97 0.001 1934_b.8640.imap 1.27E-04 0.99 0.001 1934_b.8640.qmap 1.27E-04 0.98 0.001 1934_b.8640.umap 1.27E-04 0.98 0.001 1934_b.8640.vmap 1.27E-04 0.93 0.001 ======================================================================== Explanation of Terms: --------------------- Th.Phase The theoretical closure phase (in degrees) based on thermal noise arguments (for the 5-minute time averaging used). Th. RMS The theoretical RMS in an image based on thermal noise arguments. Sigmas The factor by which the relevant measure exceeds either of the above two theoretical levels. Ideally this should be 1. D.R. Dynamic range of an image, defined as the ratio of the peak absolute value divided by the RMS. For the CLEANed Stokes-I images of the calibrators, the RMS is evaluated outside the inner quarter of the image. Otherwise the RMS is evaluated over the entire image. Pk Val Peak value in an image in Jy. Explanation of File names: -------------------------- File names are of the form FIELD.FREQ Raw visibility data, giving the field name and observing frequency. FIELD.FREQ-cal Calibrated/flagged visibility data. FIELD.FREQ.TYPE Image of a portion of the primary beam. TYPE gives the Stokes parameter and whether the image is CLEANed ("cln") or a dirty image ("map").