Thanks Ari Jokimaki and ToSeek

Your links were helpful, but I trying to find a graph of the number of quasars observed verses z. I know it is a bell shape curve and ToSeeks link shows the tail end at the highest red shift occurring at about a z of 6. I know that the lowest z of a quasar is about .06 (z) and the greatest so far is 6.4 (z) .

Ari Jokimaki’s link does show some of the middle part of bell shape curve, which is helpful. I had determined that the peak was with a z slightly greater than 2, but I was only basing that on a set of 15 quasars that I had statistical information on. The much more inclusive information in Ari’s link indicates the peak is closer to a z of 1.8. The plot also shows the skewed bell shape curve with the higher red shifts “compressing” the bell shape.

I down loaded all 2400 pages of SDSS but it is raw data and none of it kept to it’s tablature form.

Snowflake.