[daip] Regarding VLA " First sky survey" catalogue with 946432 sources.

[Prabhakar]

Dear sir,

I am Msc-PhD student at IIT Kanpur(Indian Institute of Technology, Kanpur)
(INDIA), in the Department of Physics. I am doing some project work using
VLA, First sky survey" catalogue with 946432 sources. I have some queries
regarding this catalogue.Please let me know the reason behind the quires
that I am mentioning below:

1. I saw around 170000 sources with both Bmaj and Bmin zero and around
3lakhs sources with Bmaj non zero but still Bmin zero. What it implies!

2. Through my work I have noticed when I plotted a histogram of position
angle(PA), it appeared most of the sources with PA 90 deg. and even more
sources with PA 0 and 180 deg. What it implies!

3.** As for extended sources ratio of peak_flux/flux_inte.  would be less
than 1 or close to 0.9. But most of the sources with its ratio greater
than 1. How is it possible? If yes, then What it implies!

4** I want very random data, with PA  random distribute. Is there any bias
or limitations on these data, let me know, please.
I will be very grateful for your response to these issues.
Thank you

Regards
Prabhakar
Msc-phd student
IIT kanpur(INDIA)