success was heightened by the vs was heightened by the

Some examples from the web:

• Aug 24, 2010 ... [Ackerley] aimed to shock, and his success was heightened by the soapbubble sparkle and lightness of his prose. — The New Criterion.
• Oct 1, 2015 ... The event's success was heightened by the debut attendance of European Tour pro-golfer and Friends of ANCHOR's Gala Golf patron, Richie ...
• Feb 1, 2012 ... Our success was heightened by the dedication of the staff who contributed more than what they were hired to do.” Most memorable moments: ...
• Their feeling of success was heightened by the procedure of having the AM make mistakes. Almost without exception the Ss tried to help the AM. In the process ...

Some examples from the web:

• And in the present instance, all this was heightened by the sight of the two officers of the strange ship, leaning over the side, by the perpendicular ladder of ...
• The awful effect was heightened by the piercing shrieks of the women and the fierce yells of the warriors. The Last of the Mohicans James Fenimore Cooper.
• The awful effect was heightened by the piercing shrieks of the women and the fierce yells of the warriors. What I really felt—all I really felt—was the flood of joy ...
• ... and the general public, whose frenzy was heightened by the Japanese attack of Pearl Harbor. More than two-thirds of the Japanese who were interned in the ...