lines vs border

[Petr Mikulik]

The following code
	x=0:40;y1=1+0*x;y2=x+1;y3=100+0*x; 
	semilogy(x,y1,x,y2,x,y3);legend('y1','y2','y3')
hides lines of y1 and y3 on the graph, and similarly for
	x=0:40;y1=1+0*x;y2=x+1;y3=100+0*x; 
	plot(x,y1,x,y2,x,y3);legend('y1','y2','y3')

This is caused by option "set border front" in gnuplot.
Wouldn't "set border back" be better for plots?

On the other hand: for imagesc, "set border front" looks better.

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PM