Summary of Data Quality Observations of 3/6/96 ----------------------------------------------- This report was generated on 4 June 1996 Array: 6.0D 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 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. Observations by Derek McKay and Robin Wark We note the poor data quality, which appears to be real and not accounted for by tracking the source to the horizon ======================================================================== Visibility-based statistics --------------------------- Total observing time is 9.64 hours Flagging statistics after ATLOD ------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384 8.0% 8.1% 8.1% 7.9% 8.1% 7.9% 7.8% 1934-638.2368 0.3% 0.4% 0.5% 0.2% 0.4% 0.3% 0.2% 1934-638.4800 0.1% 0.2% 0.1% 0.1% 0.2% 0.1% 0.1% 1934-638.8640 6.4% 5.9% 8.0% 6.2% 8.0% 5.1% 4.9% 1934_a.1384 7.7% 7.7% 7.7% 7.8% 7.7% 7.7% 7.7% 1934_a.2368 0.0% 0.0% 0.0% 0.0% 0.0% 0.1% 0.0% 1934_a.4800 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1934_a.8640 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1934_b.1384 7.9% 7.9% 8.0% 7.9% 7.9% 7.9% 7.9% 1934_b.2368 0.2% 0.1% 0.2% 0.1% 0.3% 0.3% 0.2% 1934_b.4800 0.1% 0.1% 0.1% 0.1% 0.1% 0.2% 0.2% 1934_b.8640 0.3% 0.2% 0.4% 0.2% 0.3% 0.2% 0.2% ---------------------------------------------- Closure phase statistics for the point sources ---------------------------------------------- File Th.Phase Sigmas ---- -------- ------ 1934-638.1384 0.014 13.79 1934-638.2368 0.019 3.95 1934-638.4800 0.038 1.82 1934-638.8640 0.067 3.51 1934_a.1384 0.014 13.29 1934_a.2368 0.023 4.83 1934_a.4800 0.033 1.94 1934_a.8640 0.086 2.87 --------------------------------------- Post-reduction flagging statistics ---------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384-cal 22.5% 22.6% 29.6% 20.9% 20.3% 21.0% 20.5% 1934-638.2368-cal 9.3% 10.5% 8.5% 7.2% 10.9% 8.5% 10.0% 1934-638.4800-cal 9.7% 12.1% 10.3% 7.7% 10.0% 8.6% 9.2% 1934-638.8640-cal 15.7% 20.1% 14.8% 14.9% 14.6% 15.3% 14.4% 1934_a.1384-cal 12.0% 13.0% 13.2% 9.8% 11.6% 10.0% 14.2% 1934_a.2368-cal 0.2% 0.1% 0.2% 0.3% 0.3% 0.3% 0.1% 1934_a.4800-cal 6.9% 10.0% 8.4% 4.7% 6.7% 5.7% 6.0% 1934_a.8640-cal 5.3% 8.7% 5.4% 3.8% 4.0% 4.0% 5.6% 1934_b.1384-cal 11.3% 11.4% 11.8% 10.7% 11.1% 11.1% 11.5% 1934_b.2368-cal 3.9% 4.4% 2.9% 4.2% 4.3% 3.0% 4.9% 1934_b.4800-cal 4.3% 3.4% 3.2% 2.9% 5.1% 4.7% 6.3% 1934_b.8640-cal 4.9% 8.4% 5.0% 3.0% 4.3% 4.3% 4.5% ======================================================================== Image-based statistics ---------------------- File Th. RMS Sigmas D.R. Pk Val ---- ------- ------ ---- ------ 1934-638.1384.icln 1.20E-04 20.97 5934 14.927 1934-638.1384.qmap 1.20E-04 9.00 0.005 1934-638.1384.umap 1.20E-04 8.72 0.005 1934-638.1384.vmap 1.20E-04 5.64 0.003 1934-638.2368.icln 1.31E-04 13.78 6400 11.579 1934-638.2368.qmap 1.31E-04 5.71 0.005 1934-638.2368.umap 1.31E-04 6.09 0.005 1934-638.2368.vmap 1.31E-04 5.80 0.004 1934-638.4800.icln 1.11E-04 7.37 7119 5.821 1934-638.4800.qmap 1.11E-04 1.97 0.001 1934-638.4800.umap 1.11E-04 1.99 0.001 1934-638.4800.vmap 1.11E-04 1.57 0.001 1934-638.8640.icln 1.13E-04 4.36 5763 2.835 1934-638.8640.qmap 1.13E-04 1.24 0.001 1934-638.8640.umap 1.13E-04 1.38 0.001 1934-638.8640.vmap 1.13E-04 2.51 0.001 1934_a.1384.icln 1.21E-04 35.69 2998 12.958 1934_a.1384.qmap 1.21E-04 9.74 0.009 1934_a.1384.umap 1.21E-04 8.80 0.005 1934_a.1384.vmap 1.21E-04 5.35 0.004 1934_a.2368.icln 1.31E-04 25.36 2463 8.165 1934_a.2368.qmap 1.31E-04 92.10 19 0.227 1934_a.2368.umap 1.31E-04 35.91 0.038 1934_a.2368.vmap 1.31E-04 47.83 16 0.101 1934_a.4800.icln 1.13E-04 8.16 5677 5.224 1934_a.4800.qmap 1.13E-04 3.81 17 0.007 1934_a.4800.umap 1.13E-04 2.15 0.001 1934_a.4800.vmap 1.13E-04 1.60 0.001 1934_a.8640.icln 1.08E-04 3.86 4884 2.042 1934_a.8640.qmap 1.08E-04 18.63 14 0.028 1934_a.8640.umap 1.08E-04 11.32 0.010 1934_a.8640.vmap 1.08E-04 17.07 12 0.022 1934_b.1384.imap 1.24E-04 6.15 0.005 1934_b.1384.qmap 1.24E-04 2.42 0.001 1934_b.1384.umap 1.24E-04 1.32 0.001 1934_b.1384.vmap 1.24E-04 1.09 0.001 1934_b.2368.imap 1.37E-04 2.12 0.001 1934_b.2368.qmap 1.37E-04 1.09 0.001 1934_b.2368.umap 1.37E-04 1.02 0.001 1934_b.2368.vmap 1.37E-04 1.07 0.001 1934_b.4800.imap 1.17E-04 1.13 0.001 1934_b.4800.qmap 1.17E-04 1.02 0.001 1934_b.4800.umap 1.17E-04 1.02 0.001 1934_b.4800.vmap 1.17E-04 1.02 0.001 1934_b.8640.imap 1.15E-04 1.13 0.001 1934_b.8640.qmap 1.15E-04 1.10 0.001 1934_b.8640.umap 1.15E-04 1.04 0.001 1934_b.8640.vmap 1.15E-04 1.03 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").