Function panPow

docs/app/js/sanddance-app.js:106699–106701

(domain, delta, exponent)

    return pan(domain, delta, log(sign), exp(sign));
}
function panPow(domain, delta, exponent) {
    return pan(domain, delta, pow(exponent), pow(1 / exponent));
}
function panSymlog(domain, delta, constant1) {
    return pan(domain, delta, symlog(constant1), symexp(constant1));
}