There's a CCR to fix this in an IC617 ISR (it may have been fixed now) which is to allow cross to return a value that it doesn't actually cross but exactly reaches. However, as I pointed out in that CCR, there's a much cleaner solution that already works (forever) and is simpler. Use xmax instead of ymax . That already gives you the x-value where the maximum occurs: xmax(clip(dB20(VF("/vout")) 10 1G )) Regards, Andrew.
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