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Hello,
Not strictly a confocal question, but I'm sure someone out there will be able to 
help.  We are about to start using a SIM super res system and have been 
advised that one of the critical factors in acquiring optimal images is the cover 
glass.  Specifcally, the thickness of the glass needs to be consistant across 
the whole coverslip (e.g. 170 um +/- 2 um), and reproducible between 
coverslips.  One option is to measure each individual coverslip before use, but 
this seems rather impractical to me.  Has anyone looked into this, and if so, 
are there any manufacturers out there who can provide cover glass with this 
high specification?
Thanks,
Simon