for (final Type type : types)
for (final double strike : strikes)
for (final int length : lengths) {
final Date exDate = today.add(length * 360);
final Exercise exercise = new EuropeanExercise(exDate);
final StrikedTypePayoff payoff = new PlainVanillaPayoff(type, strike);
// reference option
final VanillaOption refOption = makeOption(payoff, exercise, spot, qTS, rTS, volTS, EngineType.Analytic,
Constants.NULL_INTEGER, Constants.NULL_INTEGER);