createFields.H

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    const word dictName("noiseDict");

    IOdictionary dict(systemDict(dictName, args, runTime));

    // reference pressure
    scalar pRef = dict.lookupOrDefault("pRef", 0.0);

    // number of samples in sampling window
    label N = dict.lookupOrDefault("N", 65536);

    // number of sampling windows
    label nw = dict.lookupOrDefault("nw", 100);

    // lower frequency of frequency band
    scalar f1 = dict.lookupOrDefault("f1", 25.0);

    // upper frequency of frequency band
    scalar fU = dict.lookupOrDefault("fU", 10000.0);

    // graph format
    word graphFormat = dict.lookupOrDefault<word>("graphFormat", "raw");