Summary of Data Quality Observations of 31/10/96 ----------------------------------------------- This report was generated on 4 November 1996 Array: .75A 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 The correlator was not properly calculating the 12ba product. Thus, the 1-2 baseline was explicitly edited out before the reduction script was run. 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 10.57 hours Flagging statistics after ATLOD ------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384 20.1% 29.8% 29.9% 15.2% 15.4% 15.2% 15.2% 1934-638.2368 13.4% 24.1% 24.1% 8.1% 8.1% 8.1% 8.1% 1934-638.4800 14.0% 25.4% 25.1% 8.7% 8.3% 8.3% 8.3% 1934-638.8640 14.8% 26.2% 26.0% 9.1% 9.4% 9.1% 8.9% 1934_a.1384 13.1% 23.8% 23.8% 7.7% 7.7% 7.7% 7.7% 1934_a.2368 5.9% 17.5% 17.5% 0.0% 0.0% 0.0% 0.2% 1934_a.4800 6.7% 19.0% 18.9% 0.6% 0.6% 0.6% 0.4% 1934_a.8640 6.7% 19.1% 18.6% 0.6% 0.6% 0.6% 0.4% 1934_b.1384 13.1% 23.8% 24.0% 7.7% 7.7% 7.7% 7.7% 1934_b.2368 6.1% 17.6% 17.7% 0.2% 0.2% 0.3% 0.5% 1934_b.4800 6.3% 18.4% 18.4% 0.2% 0.1% 0.3% 0.1% 1934_b.8640 6.6% 18.6% 18.6% 0.4% 0.8% 0.9% 0.3% ---------------------------------------------- Closure phase statistics for the point sources ---------------------------------------------- File Th.Phase Sigmas ---- -------- ------ 1934-638.1384 0.014 21.50 1934-638.2368 0.018 5.50 1934-638.4800 0.031 1.39 1934-638.8640 0.065 1.69 1934_a.1384 0.013 37.38 1934_a.2368 0.022 5.73 1934_a.4800 0.031 1.58 1934_a.8640 0.088 1.62 --------------------------------------- Post-reduction flagging statistics ---------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384-cal 31.0% 38.4% 43.5% 24.4% 26.4% 27.8% 25.8% 1934-638.2368-cal 19.1% 29.3% 29.2% 14.4% 13.6% 14.0% 14.3% 1934-638.4800-cal 19.7% 30.7% 30.8% 13.0% 14.0% 14.7% 14.9% 1934-638.8640-cal 20.4% 29.7% 31.0% 14.8% 14.3% 16.6% 15.8% 1934_a.1384-cal 18.0% 26.7% 33.0% 9.0% 13.6% 12.4% 13.2% 1934_a.2368-cal 5.9% 17.6% 17.6% 0.1% 0.1% 0.1% 0.2% 1934_a.4800-cal 12.0% 23.7% 22.6% 3.4% 5.7% 8.7% 7.7% 1934_a.8640-cal 11.4% 22.4% 26.0% 4.1% 5.0% 5.7% 5.3% 1934_b.1384-cal 15.0% 26.3% 25.2% 10.9% 9.4% 9.1% 9.2% 1934_b.2368-cal 9.5% 18.9% 20.5% 6.5% 3.4% 3.2% 4.7% 1934_b.4800-cal 10.5% 24.8% 20.7% 3.1% 6.3% 5.1% 2.9% 1934_b.8640-cal 12.8% 27.6% 22.3% 9.4% 8.0% 5.6% 4.2% ======================================================================== Image-based statistics ---------------------- File Th. RMS Sigmas D.R. Pk Val ---- ------- ------ ---- ------ 1934-638.1384.icln 1.34E-04 10.13 11028 14.932 1934-638.1384.qmap 1.34E-04 9.54 0.006 1934-638.1384.umap 1.34E-04 7.94 0.005 1934-638.1384.vmap 1.34E-04 4.71 0.003 1934-638.2368.icln 1.39E-04 13.00 6395 11.576 1934-638.2368.qmap 1.39E-04 7.38 0.005 1934-638.2368.umap 1.39E-04 6.22 0.004 1934-638.2368.vmap 1.39E-04 5.95 0.005 1934-638.4800.icln 1.18E-04 6.25 7921 5.825 1934-638.4800.qmap 1.18E-04 2.16 0.001 1934-638.4800.umap 1.18E-04 2.01 0.001 1934-638.4800.vmap 1.18E-04 1.76 0.001 1934-638.8640.icln 1.27E-04 2.82 7892 2.837 1934-638.8640.qmap 1.27E-04 1.30 0.001 1934-638.8640.umap 1.27E-04 1.24 0.001 1934-638.8640.vmap 1.27E-04 1.28 0.001 1934_a.1384.icln 1.23E-04 14.38 7502 13.304 1934_a.1384.qmap 1.23E-04 9.39 0.008 1934_a.1384.umap 1.23E-04 7.92 0.005 1934_a.1384.vmap 1.23E-04 4.99 0.005 1934_a.2368.icln 1.26E-04 11.70 5730 8.461 1934_a.2368.qmap 1.26E-04 40.78 27 0.141 1934_a.2368.umap 1.26E-04 28.16 11 0.038 1934_a.2368.vmap 1.26E-04 30.37 14 0.055 1934_a.4800.icln 1.11E-04 6.59 7296 5.314 1934_a.4800.qmap 1.11E-04 3.19 21 0.007 1934_a.4800.umap 1.11E-04 2.26 0.001 1934_a.4800.vmap 1.11E-04 1.86 0.001 1934_a.8640.icln 1.19E-04 2.86 6313 2.150 1934_a.8640.qmap 1.19E-04 9.79 16 0.019 1934_a.8640.umap 1.19E-04 7.88 0.008 1934_a.8640.vmap 1.19E-04 12.20 11 0.015 1934_b.1384.imap 1.21E-04 7.00 22 0.018 1934_b.1384.qmap 1.21E-04 1.49 0.001 1934_b.1384.umap 1.21E-04 1.19 0.001 1934_b.1384.vmap 1.21E-04 1.04 0.001 1934_b.2368.imap 1.28E-04 2.44 15 0.005 1934_b.2368.qmap 1.28E-04 1.08 0.001 1934_b.2368.umap 1.28E-04 1.05 0.001 1934_b.2368.vmap 1.28E-04 0.99 0.001 1934_b.4800.imap 1.11E-04 1.08 0.001 1934_b.4800.qmap 1.11E-04 0.99 0.000 1934_b.4800.umap 1.11E-04 1.04 0.001 1934_b.4800.vmap 1.11E-04 1.05 0.001 1934_b.8640.imap 1.21E-04 1.05 0.001 1934_b.8640.qmap 1.21E-04 1.05 0.001 1934_b.8640.umap 1.21E-04 0.99 0.001 1934_b.8640.vmap 1.21E-04 1.01 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").