unexpected output with 'dumb' terminal with ansi

[bgkillas]

if i keep 'ansi' from fg.set_terminal(..) then it doesn't print the axis, but if i dont have 'ansi' it does print the axis, i cant replicate this on gnuplot

use gnuplot::Figure;
fn main()
{
 let mut fg=Figure::new();
 fg.set_terminal("dumb size 100,50 aspect 1,1 ansi","");
 let a=1000;
 let mut x=Vec::new();
 let mut y=Vec::new();
 for i in 1..=a
 {
  x.push(i as f64/a as f64);
  y.push((i as f64/a as f64).powf(2.0));
 }
 fg.axes2d().lines(x,y,&[]);
 fg.show();
}