Define altitude when printing.

Section	Variable
features	altitude

Values:

Low: Operating below 1000 m
High: Operating above 1000 m

From some internet source:

‍The higher the altitude, the more printing problems you may encounter, including ghost images appearing on documents, loose toner appearing on one or more documents, and the print on all documents appearing light. Certain laser printers include a High Altitude Correction component that eliminates the problems associated with operating a printer in a high altitude location.

Note: If altitude isn't set, it defaults to Low