SSSC17_WSRT.MS

This simulation introduces multiple sources. As well as the central 10 Jy point source which you should be sick of by now, we also have a faint source in the field. This additional 3 Jy source has the same position as the offset we introduced in SSSC16.

The modified LSM file is copied in the data products below, as is the kvis annotation file.

As usual we're adding the electronic gain error G-Jones with a +/- 20% time-dependent variation, and no other corruption effects.

Once we've built the tree it is executed and the visibilities are written to the DATA column of the Measurement Set.

Make an image in the usual way and examine it, the second fainter source should be apparent beneath the sidelobe structure of the central source.

One thing you might have noticed is how the image in the PURR log is upside-down compared to the image in your favourite FITS viewer. I think this is down to how Python handles images versus how the FITS format handles images. For Python the (0,0) pixel is at the top left corner, whereas a FITS file thinks it's at the lower left. PURR uses a Python routine to render the FITS files into web-friendly PNGs, as well as to perform all the stats and produce the histograms.

Have a look at the screen grab in the data products below. Examining the tree is a useful way to keep track on what's going on, and a rapid way to track errors...