mutable params = {
let output = {};
output["svg"] = {
"width": 954,
"height": 600
};
output["margin"] = {
"top": 72,
"right": 24,
"bottom": 72,
"left": 24
};
output["plot"] = {
"x": output["margin"]["left"],
"y": output["margin"]["top"],
"width": output["svg"]["width"] - output["margin"]["left"] - output["margin"]["right"],
"height": output["svg"]["height"] - output["margin"]["top"] - output["margin"]["bottom"]
};
return output;
}