src/charts/stacked-area.js
function setEpsilon() {
            let dates = dataByDate.map(({date}) => date);

            epsilon = (xScale(dates[1]) - xScale(dates[0])) / 2;
        }
function setEpsilon() {
            let dates = dataByDate.map(({date}) => date);

            epsilon = (xScale(dates[1]) - xScale(dates[0])) / 2;
        }
function setEpsilon ( ) { let dates = dataByDate . map ( ( { date } ) => date ) ; epsilon = ( xScale ( dates [ 1 ] ) - xScale ( dates [ 0 ] ) ) / 2 ; }
Epsilon is the value given to the number representing half of the distance in
pixels between two date data points
@return {Number} half distance between any two points
Epsilon is the value given to the number representing half of the distance in pixels between two date data points