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Martin,
The Lunt CaK module is quoted as 2.2A bandwidth.
If you stacked two ($$$$) the best you'd get would be around 1.4A.
That's not enough resolution to pick out the K2 features which lie only 0.2A either side of the core and are only 0.1 to 0.15A wide.
The SHG is the way to go!!
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