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Increased noise after saving image

From: Jen
Subject: Increased noise after saving image
Date: Wed, 18 Oct 2017 04:52:54 -0700 (MST)


I have plotted my data using plot and plotyy. However, when saving the data,
using either print or the save function from the figure window seems to
increase the noise level in my data. That is, the graph I see when using
plot does not look the same as the one I have saved. 

Is there some kind of smoothing done when plotting? Or why is there a
discrepancy between what I see and what is saved?



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