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That graph looks nothing like any diode LPM I've ever seen.... Something makes me doubt it's legitimacy
 
^^ I'll second that. Reminds me of something like a mode hopping DPSS, but still those spikes are unrealistic IMO. Maybe WL just has crap LPM's. Actually, scratch that maybe..
 
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It's more like the LPM is digital and has very low resolution .. like it can measure only 6 values. In such case such 'hopping' would be normal.
But why has LPM such low resolution is beyond me.
 
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