[IGSSTATION-6117] GRAC - antenna change

[Marie Chalmel]

Author:Marie Chalmel

Dear colleagues,

The antenna of the station GRAC (France) has been changed on 2015-03-10 
13:00. The new one is the same model but we suspect a problem with the 
previous one : the position calculated is different of approximately 2 
cm for the north and the up components. The results are now consistents 
with the older antennas.

Missing Rinex files have been submitted.
An updated logsite has also been submitted.

Please apologise for any inconvenience.

Regards,

Marie Chalmel
IGN
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