}
private void checkSingleTabulated(final Ops.DoubleOp f, final String tag, final double expected, final double tolerance) {
final Integrator quad = new GaussKronrodPatterson();
final double realised = quad.op(f,-1,1);
if (Math.abs(realised-expected) > tolerance)
fail(" integrating " + tag + "\n"
+ " realised: " + realised + "\n"
+ " expected: " + expected);