I'd never expect a flat line - for one seeing and scintillation would always produce errors - you just have to try and adjust PHD not to respond to these errors where possible.
Craig is considering multi-star guiding - I've dropped him a few articles, notes and excel files comparing guide performane from 1 -> 20 stars (averaging each star's local gude error can significant improve guiding out drift - not seeing). Hope will get it before Feb 2010 - as even a 5 star guide should halve guide errors based on the MaximDL Multi-star guide add on results.
Matt
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