To: Xiang Subject: EX006 Dear PI, We have examined your project (EX006,03/03/2006) and are releasing the data to you. Please let us know whether you would like us to send you the FITS file(s) on DAT tape or DVDs, or whether you would prefer to download the data directly from the EVN data archive (see below). The experiment scheduled the following telescopes: JbWbEfOnMcNtTrShUrHh. Your experiment was processed with the following parameters: Pass1: 10 Tels, 4 band X 2 pols, each with 16 points, 2 sec int. The originally recorded media (tapes/disks) from the stations can be released after two weeks. If you have any questions, contact us at jops@jive.nl. EVN and Global VLBI Observations correlated at the EVN MkIV Data Processor at JIVE are now automatically calibrated via a pipeline process. You will receive email notification when the pipeline is complete. In particular, the a priori amplitude calibration table (and the associated, final ANTAB file), plus various other tables and plots (derived only from scheduled calibrator scans) will be available to download from the EVN archive. A description of the pipelining process can be found at: www.evlbi.org/pipeline/user_expts.html The EVN data archive at JIVE is now a central location for obtaining the information you need in reviewing your project. You can find network feedback from the stations, standard plots from the correlation review done here prior to distribution, pipeline results, and the FITS files themselves. Contact your support scientist to arrange for a password with which you can download your FITS file(s) from the archive directly. See the EVN Users' Guide in www.evlbi.org for a link to the EVN Archive policy -- in short, data from sources you identified as target/private in pre-correlation e-mail will not be made public, nor will pipeline images be made from them, for one year from distribution. The archive can be accessed via: www.jive.nl/archive/scripts/listarch.php (or via the menu items of the main jive page www.jive.nl). Once in the EVN data archive, there are two ways to reach your experiment: 1) click on your experiment in the pull-down menu in the "Select Experiment" window; then click on the link "Show Experiment" that will appear immediately below this. 2) click on "Show Catalogue of Experiments", then click on your experiment in the left-hand column of the new window. Both paths will lead to you a new window for your experiment, from which you can select from the various sorts of data available from the menu in the left-hand column. JIVE also invites PIs to visit Dwingeloo in order to analyze EVN data. Financial assistance may be available to all users located within the EU (and associated states). Contact campbell@jive.nl for more details. General Remarks: In the process of checking your experiment we have created plots of the weights vs time, auto- and cross-correlation spectra for a few one-minute intervals, and the behavior of amplitude and phase in time. These plots and an explanatory supplement can be found on the EVN data archive. As part of the check-out procedure, we evaluate the quality of all data with low weights and set an appropriate cutoff for flagging. In this experiment the cutoff was set at 0.4. If you observed with 2-bit sampling, your data have been corrected with an improved van Vleck correction to account for the statistics of high/low bits for each BBC's data stream at each station. Thus you shouldn't run ACCOR in AIPS. It should be okay to use autocorrelations for bandpass corrections or to use ACFIT. Remarks on plots or individual stations: Jb: Problem with source tracking until end of the first day. Fringes were lost intermittently as a result. Wb: No data lost, but it was snowing. Ef: Data from 12:00 to 16:00 and 20:39 to 00:23 lost due to snow. On: Mc: Nt: No data from 2:15 to 7:00 on day 2. Tr: Subband 3 (aka AIPS IF 4) LCP has no signal and has been flagged. Sh: First 10 scans lost to a recorder problem. Ur: Data from start to 13:54 and from 16:05 to 16:33 lost to a formatter problem. Hh: Further remarks: