Function tpmt

external/.d3.js:5074–5076

(x)

// tpmt is two power minus ten times t scaled to [0,1]
function tpmt(x) {
  return (Math.pow(2, -10 * x) - 0.0009765625) * 1.0009775171065494;
}

function expIn(t) {
  return tpmt(1 - +t);