 The west front has two 13th century buttressed towers 27 @.@ 4 metres ( 90 ft ) high that were originally topped with wooden spires covered in protective lead . Although the difference between the construction of the base course and the transepts suggests that the towers were not part of the initial design , it is likely that the building process was not so far advanced that the masons could fully integrate the nave and towers into each other ( Fig . 7 ) . 
 The west front <a href='been_done' title='1'><mark>has</mark></a> two 13th century buttressed towers 27 @.@ 4 metres ( 90 ft ) high <a href='null_relcl' title='2'><mark>that</mark></a><a href='uninflect' title='3'><mark>were</mark></a> originally topped with wooden spires covered in protective lead . Although the difference between the construction of the base course and the transepts <a href='uninflect' title='4'><mark>suggests</mark></a> that the towers <a href='negative_concord' title='5'><mark>were</mark></a> <a href='negative_concord' title='6'><mark>not</mark></a><a href='negative_concord' title='7'><mark>part</mark></a> of the initial design , it is likely that the building process <a href='negative_concord' title='8'><mark>was</mark></a> <a href='negative_concord' title='9'><mark>not</mark></a>so far advanced that the masons could fully integrate the nave and towers into each other ( Fig . 7 ) . 
Da west front done two 13th century buttressed towers 27 @.@ 4 metres ( 90 ft ) high was originally topped with wooden spires covered in protective lead . Although the difference between tdaconstruction of thdaase course and thedaansepts suggest dat the daers ain't no part of the initial design , it is likely that the building process ain't so far advanced that the mdans could fully integrate the nave and towers into each other ( Fig . 7 ) .