Mounted or not?

All my slides are stored mounted in slide projector trays, ready for viewing. But what difference does this make to the quality of the scans? I decided to perform a quick test to see. The picture I used is shown below, with several sets of zoomed in sections. Although there is a difference, I'm not sure it's worth the effort of rescanning the whole lot out of mounts!

 

 
 
 

 

(In case you were wondering, the left hand versions are in the mounts, the right hand ones slapped straight on the scanner)

 

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