bloomberg vs. reuter for stock quotes

zeeck

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I'm just starting to get back into technical anaylsis after a long break.
I am sure there's probably a simple answer to this for those who watch the markets closely.
I have checked a few stock quotes for certain stocks on both reuters and bloomberg. I notice the VOLUME is different. can someone tell me why this is?

FOR EXAMPLE:
for today (may 24) THE VOLUME TRADED for AT&T is as follows:
bloomberg: 15,645,676
reuters: 4,576,606

I have checked other stocks and it appears the volume is always much higher on bloomberg. why the difference? and if I am doing technical analysis with software, do I want the higher volume number of the lower volume number?

thanks
 
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