Epson SureColor P20000 Standard Edition 64" Large-Format Inkjet Printer - Manual (Page 133)

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Settings Options Description
Select Reference Paper Photo Paper
Proofing Paper
Fine Art Paper
Matte Paper
Plain Paper
Others
No Paper Selected
Lets you select the type of paper that is
closest to the paper for which you are
creating a custom paper configuration:
Platen Gap 1.2
1.6
2.1
2.4
Adjusts the gap between the media and
the print head. Leave the setting at the
default for most media. If printouts are
smeared, increase the setting. This
setting is not affected by the
Platen Gap
setting in the Printer Setup menu.
Paper Thickness 0.1 to 1.5 Lets you print patterns that you can use
to determine the thickness of the current
paper by selecting the pattern number
with the least misalignment when you
create a custom paper configuration.