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WILMA autocorrelator.

WILMA has a fixed resolution of 2 MHz and bandwidth of 1024 MHz
(theoretical), of which about 930 MHz are practically usable.
2 WILMA parts (times 9) can be connected to HERA1 and/or HERA2.

For now, WILMA can only be used with the HERA receiver.

<< TBD:
2 WILMA parts can be connected single-pixel receivers (future:
8 WILMA parts, of which at most 2 parts can be connected to the
same receiver). 
>>

