Epson Stylus C41 Series User Manual page 77

From each pattern on the printed test sheet, choose the vertical
line that is aligned best. For each pattern, select the corresponding
line number from the appropriate drop-down list box in the Print
Head Alignment dialog box, and then click Finish to put the new
settings into effect.
Note:
If you cannot find a line which is aligned correctly, select the number of
the line which is the closest to being correct and click Realignment.
The lines you selected will be reset to the center (number 8) position and
the alignment test sheet will be printed again.
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Printer Software Functions