box [imargin.left=45] {
    (0,190)->(200,); 
    mark 30; mark 50; mark 70; mark 90; 
    mark 110; mark 130; mark 150; mark 170;
    180:time [label.pos=below, text.bgcolor=none];

    (10, 0)<-(, 200);
    mark 30; mark 50; mark 70; mark 90; 
    mark 110; mark 130; mark 150; mark 170; 
    180:effort [label.pos=left, text.bgcolor=none];
}