{HEAD ~ The timing} of {TAIL ~ discharge} of ink from the printing head is corrected to cancel out the determined amount of variation, and printing is performed based on image data in accordance with the corrected timing 
of
{ HEAD ~ The timing } of { TAIL ~ discharge } of ink from the printing head is corrected to cancel out the determined amount of variation , and printing is performed based on image data in accordance with the corrected timing
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH