Use the halftones-supported attribute to specify the screen-frequencies-supported attribute values. (See halftones-supported for more information.) The screen-frequencies-supported attribute is supported to maintain downward compatibility, but it is not the recommended attribute for specifying screen frequencies for printing halftones.
Identifies the screen frequencies used for printing halftones that this actual destination supports.
You can enter any of these fixed values:
71, 85, 106, 141
InfoPrint compares the document attribute screen-frequency to this attribute for validation and scheduling.