import graph;
size(7.5cm,0);

xlimits(min=-7,max=8);

xaxis("$x_1$",Ticks());

tickmodifier valeurssansgrad;

valeurssansgrad=OmitTick(-2,5);
xaxis(axis=YEquals(-4),"$x_2$",Ticks(valeurssansgrad));

valeurssansgrad=OmitTickInterval(1,5);
xaxis(axis=YEquals(-8),"$x_3$",Ticks(valeurssansgrad));

valeurssansgrad=OmitTickIntervals(new real[]{1,-4},new real[]{5,-2});
xaxis(axis=YEquals(-12),"$x_4$",Ticks(valeurssansgrad));

real[] a={-4,3}, b={-2,5};
valeurssansgrad=OmitTickIntervals(a,b);
xaxis(axis=YEquals(-16),"$x_5$",Ticks(valeurssansgrad));

shipout(bbox(3mm,Fill(white)));