Parameter loading for PC-SPAN..?

H

heech

Hi,

I decided to pay $500 for PC-SPAN, so I can better understand the margin requirements for my future options account (primarily trading NYBOT/CME).

I'm just not sure how to figure out which parameter files I need to be using. I'm looking here:

ftp://ftp.cmegroup.com/pub/span/data/cme/

What's the naming convention here? 'a'? 'c'? 'e'? 'i'?

Help?
 
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