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Rob & Les,
I must say I am astounded at what you have provided. I second Paddy's vote of thanks for your answers. I didn't expect this level of thourghness.
The little I know about GCs is that they tend to be concentrated in a volume of space inside us around the Milky Way's core. This would explain the level of dust obstruction we observe. Imagine the brilliant show that would behold our eyes if the dust were not there!
It so happens that Mr Average, M4, is one of my favourite targets. Not being as dense a Omega Centuri, it affords finer patterns to be traced. I had also noticed a slight 'yellowing' of its stars, Les, compared to Omega. Now I know why, and it is not a peculiarity of GCs.
Fabulous stuff, gentlemen.
Alex.
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