static const xstrmap knownTypeProps = xstrmap()
    .add("dcrlm", "red limits")
    .add("dcglm", "green limits")
    .add("dcblm", "blue limits")
    .add("dcalm", "alpha limits")
    .add("dcrsn", "red sinusoid")
    .add("dcgsn", "green sinusoid")
    .add("dcbsn", "blue sinusoid")
    .add("dcasn", "alpha sinusoid")
    .add("dcrcu", "red clampUp")
    .add("dcgcu", "green clampUp")
    .add("dcbcu", "blue clampUp")
    .add("dcacu", "alpha clampUp")
    .add("dcrcd", "red clampDown")
    .add("dcgcd", "green clampDown")
    .add("dcbcd", "blue clampDown")
    .add("dcacd", "alpha clampDown")
    .add("dcrsq", "red sequence")
    .add("dcgsq", "green sequence")
    .add("dcbsq", "blue sequence")
    .add("dcasq", "alpha sequence");