import “azimuthal”; import “geo”; import “projection”;

var d3_geo_stereographic = d3_geo_azimuthal(

function(cosλcosφ) { return 1 / (1 + cosλcosφ); },
function(ρ) { return 2 * Math.atan(ρ); }

);

(d3.geo.stereographic = function() {

return d3_geo_projection(d3_geo_stereographic);

}).raw = d3_geo_stereographic;