GENERAL EA058B, 21 cm experiment on 2017 Oct 30. Participating stations: Jb Wb Mc O8 Ur Tr Sv Zc Bd Cm Da Kn Ta Ef
You can find information on individual stations at: http://www.evlbi.org/user_guide/EVNstatus.txt.

The following are plots from the EVN pipeline analysis, in which the refant was: Ef



/// POSSM_AUTOCORR Auto-corr Amplitude vs frequency plots for each station showing all IFs and Pols. RFI can easily be found by looking at the continuum source scans in this plot.
You can see that Ur has only IFs 5,6,7,8 and Cm, Da, Kn, Ta have only IFs 1,2,3,4. Also, note there is quite a bit of RFI needing flagging. /// VPLOT_UNCAL Amp and phase vs time, for the whole experiment. Shows visibilities on all baselines to the refant. All IFs and Pols shown. This is a good place to look for stations that missed scans during the experiment.

/// POSSM_UNCAL Uncalibrated, vector averaged, cross power specra for baselines to the refant. No bandpass done yet. This is a good place to check how well detected sources are on each baseline.

Again, note that the missing first 4 IFs for Ur, Cm, Da, Kn, and Ta are normal. /// POSSM_CPOL /// TSYS Plots of system temperature vs time for each station (and each IF). Flat-line plots indicate that this information was not available for a given station, in which case we create a generic tsys table scaled to the station's gain (Jy/K).
/// GAIN Gain info in CL2, determined using tsys tables. Plot shows Gain vs time for each station, each IF and each Pol.
/// FRING_DELAY Plot of SN2. Shows delay vs time from FRING results (usually only calibrators and reference sources). This is a good place to look for times where FRING failed to get solutions. Here FRING uses a signal to noise cutoff of 7.
/// FRING_RATE SN2 as above, but for rate.
/// FRING_PHAS Plot of CL3. This is the CL table generated using CL2 (amplitude cal) and SN2 (FRING solutions). Plot shows phase calibration data vs time. Missing data indicate possible issues in those previous steps. If the data are complete (all stations and most scans present) then use this table to phase-reference the target.
Plenty of good solutions here. /// BANDPASS Plot of BP1; the bandpass characteristic of each station, determined using the brightest source(s) in the experiment. Look for small dispersion in the phase data, this indicates a high signal to noise - which will lead to better bandpass characterisation.
/// VPLOT_CAL Plot of visibilities vs time for all baselines to the refant, after applying CL3. This is a good place to look for quickly checking the success of the antab (CL2) and FRING (CL3) stages of the pipeline.
/// POSSM_CAL Amp and phas vs frequency plots for all baselines to refant, after applying CL3 and BP1. If CL3 and BP1 are good you will get flat phase and amplitude profiles, therefore this is a good place to check the success of CL2 and particluarly BP1 for each scan/baseline/IF/Pol.
/// IMAPN Naturally-weighted dirty maps of phase-referenced targets.
/// IMAPU Uniformly-weighted dirty maps of phase-referenced targets.
/// CALIB_PHAS1 Individual plots for each source that was used in FRING. Shows phase selfcal solutions (SN1 after SPLIT). This is particularly useful to check if the reference source could be self-calibrated, and to look for missing scans/antennae.
/// CALIB_AMP2 Individual plots for each source that was used in FRING. Shows amplitude selfcal solutions (SN2). This table is important to properly calibrate amplitudes from stations that had to use generic tsys tables (see TSYS, above).
/// SENS Plot of CL4 which shows amplitude calibrations determined from CL3 and the amplitude selfcal solutions from SN2 (from CALIB_AMP2, above). Comparison with GAIN plot (above) reveals the accuracy of the apriori amplitude calibration derived from the TSYS tables - this is particularly important for stations that have generic generated TSYS tables; Tsys may benefit from aditional scaling if there is a large difference in SENS and GAIN plots.
/// CLPHS Closure phases for all triangles of antennae in the array. Individual plots for each source which was used in FRING.
/// VPLOT_MODEL Similar to VPLOT_CAL for sources used in FRING, however each source has been individually SPLITed and modelled.
/// UVCOV Plot of the UV coverage for each source during the experiment.
/// UVPLT Plot of amplitude vs baseline lenght for each source. This can be useful to look for indications of structure at different angular scales.

/// ICLN CLEANed image of each source (FRINGed or phase-referened) after applying all relevant calibration by the pipeline up to CL4; amplitude and phase selfcal calibrations.
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