You can have the best presses and the best plate imaging available, however, because you are covering a sheet of paper with a mix of oil and water, squeezing and pulling it through the press - some amount of misregistration is an inevitable fact of press life. The impact of that misregistration on color and tone reproduction will depend on whether you are using an AM/XM or FM screen.
Here is a full sized image:
And here, enlarged, is a section of the image using an AM/XM screen on the left and an FM
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