With PhotoGrade off, the LaserWriter IIf and LaserWriter IIg are just like the LaserWriter IINTX:
   Frequency: 53 lpi
   Screen Angle: 45 degrees
 
With PhotoGrade on, there are five settings available via the LaserWriter Utility.  Here are the numbers:
 
    Far right:      Frequency: 150 lpi; Screen Angle:  0 degrees
   Middle right:   Frequency: 106 lpi; Screen Angle: 45 degrees
   Center:         Frequency:  83 lpi; Screen Angle: 56 degrees
   Middle left:    Frequency:  75 lpi; Screen Angle:  0 degrees
   Far Left:       Frequency:  53 lpi; Screen Angle: 45 degrees
 
   Note: The "Middle right" setting is the default PhotoGrade setting.