Trapezoidal numerical integration was implemented instead of rectangle one.
Trapezoidal numerical integration was implemented instead of rectangle one.

yhirokawa/ARTED,yhirokawa/ARTED,ARTED/ARTED,mnakao/ARTED.xacc,yhirokawa/ARTED,mnakao/ARTED.xacc,ARTED/ARTED,mnakao/ARTED.xacc,ARTED/ARTED,yhirokawa/ARTED,ARTED/ARTED