### 99/10/19 - 99/11/04
    Correlation values (both 17 and 34 GHz) of the all combinations with E13 
    antennas were lower during this period.  This trouble was caused by a
    hardware trouble(improper contacts of connectors).  Impact of this error
    on synthesized images will be negligible due to self calibration.

### 99/10/22
    Antenna tracking error occurred during the periods:
    Oct. 22 00:22 - 00:27 and Oct. 22 00:42 - 00:46. (UT)
    Synthesized images are deformed. Small tracking error might 
    have happened from the beginning of the observation (Oct. 21 22:45) 
    until Oct. 22 00:22.
    Delay tracking error might have caused image deterioration whole day.
    Both are caused by errors in clock synchronization of the controller PCs.