Epson Stylus PHOTO 950 User Manual page 240

The following are examples of the second test patterns that will
be output by the printer.
From each pattern on the printed test sheet, choose the least
grainy one. For each pattern, select the corresponding pattern
number from the appropriate drop-down list box in the Print
Head Alignment box, then click Finish to put the new settings into
effect.
231
Using the Printer Software for Macintosh