Globex Euro-Dollar Futures Options in IB

Why are there two different Expirys for one month?

For example MAR 14 '08 and MAR 17 '08. The MAR 14 one looks like it has more bids.
 
Quote from FullyArticulate:

These are most likely mid-curve options. IB lists them as GE1, GE3, etc.

Yes, I noticed the MAR 14 one displays under GE0, but may I ask what is a mid-curve option?
 
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