Summary of Data Quality Observations of 2/01/97 ----------------------------------------------- This report was generated on 6 January 1997 Array: .75D 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 Approximately one hour was lost between HA: -00:30 and 00:30 following the crash of the observing computer (NOEL), and the use of the time by engineers to replace some marginal equipment. This meant that array had to be recalibrated in amplitude and phase at this time. 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 9.39 hours Flagging statistics after ATLOD ------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384 7.7% 7.7% 7.7% 7.7% 7.7% 7.7% 7.7% 1934-638.2368 0.2% 0.5% 0.1% 0.1% 0.1% 0.1% 0.1% 1934-638.4800 0.2% 0.1% 0.1% 0.1% 0.1% 0.5% 0.1% 1934-638.8640 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1934_a.1384 7.7% 7.7% 7.7% 7.7% 7.7% 7.7% 7.7% 1934_a.2368 0.1% 0.0% 0.0% 0.2% 0.0% 0.0% 0.0% 1934_a.4800 0.7% 0.4% 0.4% 0.4% 0.4% 2.1% 0.4% 1934_a.8640 0.1% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 1934_b.1384 8.1% 7.9% 8.2% 7.9% 7.9% 8.4% 8.0% 1934_b.2368 0.4% 0.3% 0.4% 0.7% 0.4% 0.4% 0.4% 1934_b.4800 0.4% 0.2% 0.2% 0.2% 0.5% 0.7% 0.5% 1934_b.8640 0.1% 0.1% 0.2% 0.1% 0.1% 0.2% 0.1% ---------------------------------------------- Closure phase statistics for the point sources ---------------------------------------------- File Th.Phase Sigmas ---- -------- ------ 1934-638.1384 0.015 24.13 1934-638.2368 0.021 5.38 1934-638.4800 0.030 1.20 1934-638.8640 0.060 1.32 1934_a.1384 0.013 21.85 1934_a.2368 0.022 6.00 1934_a.4800 0.033 1.61 1934_a.8640 0.081 1.36 --------------------------------------- Post-reduction flagging statistics ---------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384-cal 21.7% 21.4% 26.1% 22.4% 20.6% 17.3% 22.7% 1934-638.2368-cal 7.4% 7.9% 7.0% 5.2% 5.4% 7.2% 11.6% 1934-638.4800-cal 5.2% 5.7% 4.8% 4.7% 5.1% 4.7% 6.0% 1934-638.8640-cal 4.9% 5.0% 5.1% 4.9% 4.8% 4.9% 5.0% 1934_a.1384-cal 13.7% 12.6% 18.9% 11.0% 11.3% 12.8% 15.7% 1934_a.2368-cal 1.7% 1.0% 1.0% 1.1% 1.0% 1.0% 4.8% 1934_a.4800-cal 7.5% 10.2% 9.5% 6.3% 6.3% 8.7% 4.0% 1934_a.8640-cal 8.5% 7.5% 6.9% 9.0% 9.5% 10.0% 8.1% 1934_b.1384-cal 11.9% 13.2% 13.0% 10.3% 10.4% 10.7% 13.6% 1934_b.2368-cal 5.2% 2.5% 4.1% 5.9% 2.4% 5.5% 10.7% 1934_b.4800-cal 1.7% 1.5% 1.4% 1.4% 1.6% 2.2% 2.0% 1934_b.8640-cal 7.3% 7.9% 5.0% 6.7% 9.4% 10.4% 4.4% ======================================================================== Image-based statistics ---------------------- File Th. RMS Sigmas D.R. Pk Val ---- ------- ------ ---- ------ 1934-638.1384.icln 1.24E-04 14.67 8238 14.938 1934-638.1384.qmap 1.24E-04 12.58 0.008 1934-638.1384.umap 1.24E-04 13.00 0.008 1934-638.1384.vmap 1.24E-04 6.18 0.003 1934-638.2368.icln 1.34E-04 15.46 5586 11.577 1934-638.2368.qmap 1.34E-04 6.48 0.005 1934-638.2368.umap 1.34E-04 6.25 0.004 1934-638.2368.vmap 1.34E-04 4.29 0.003 1934-638.4800.icln 1.13E-04 5.83 8869 5.825 1934-638.4800.qmap 1.13E-04 2.26 0.001 1934-638.4800.umap 1.13E-04 2.33 0.001 1934-638.4800.vmap 1.13E-04 1.89 0.002 1934-638.8640.icln 1.17E-04 2.97 8158 2.838 1934-638.8640.qmap 1.17E-04 1.62 0.001 1934-638.8640.umap 1.17E-04 1.53 0.001 1934-638.8640.vmap 1.17E-04 1.31 0.001 1934_a.1384.icln 1.23E-04 21.23 5073 13.207 1934_a.1384.qmap 1.23E-04 11.58 0.010 1934_a.1384.umap 1.23E-04 12.42 0.007 1934_a.1384.vmap 1.23E-04 5.72 0.005 1934_a.2368.icln 1.31E-04 12.74 5085 8.481 1934_a.2368.qmap 1.31E-04 46.27 24 0.146 1934_a.2368.umap 1.31E-04 36.26 11 0.054 1934_a.2368.vmap 1.31E-04 33.66 15 0.067 1934_a.4800.icln 1.15E-04 6.14 7587 5.367 1934_a.4800.qmap 1.15E-04 3.25 19 0.007 1934_a.4800.umap 1.15E-04 2.37 0.001 1934_a.4800.vmap 1.15E-04 1.84 11 0.002 1934_a.8640.icln 1.21E-04 2.58 7043 2.193 1934_a.8640.qmap 1.21E-04 12.13 16 0.023 1934_a.8640.umap 1.21E-04 8.93 0.010 1934_a.8640.vmap 1.21E-04 11.82 13 0.018 1934_b.1384.imap 1.19E-04 10.36 14 0.017 1934_b.1384.qmap 1.19E-04 8.05 0.004 1934_b.1384.umap 1.19E-04 6.79 0.003 1934_b.1384.vmap 1.19E-04 3.56 0.002 1934_b.2368.imap 1.31E-04 2.77 15 0.006 1934_b.2368.qmap 1.31E-04 1.40 0.001 1934_b.2368.umap 1.31E-04 1.20 0.001 1934_b.2368.vmap 1.31E-04 1.18 0.001 1934_b.4800.imap 1.09E-04 1.13 0.001 1934_b.4800.qmap 1.09E-04 1.05 0.001 1934_b.4800.umap 1.09E-04 1.04 0.001 1934_b.4800.vmap 1.09E-04 1.01 0.001 1934_b.8640.imap 1.20E-04 1.02 0.001 1934_b.8640.qmap 1.20E-04 1.08 0.001 1934_b.8640.umap 1.20E-04 1.09 0.001 1934_b.8640.vmap 1.20E-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").