Question: plotting graph in 2d

Hi friends. Am trying to plot a graph that shows the difference between cubic spline, crank 

nicolson and exact soution in 2d through this command but am not able to get it. 

Whereas table is mentioned below at t=0.05

x	cubic	 crank	  exact
0.05	0.0879	0.0855	0.0756
0.15	0.2514	0.2446	0.2194
0.25	0.3807	0.3708	0.3417
0.35	0.4625	0.4512	0.4305
0.45	0.4928	0.4815	0.4773
0.55	0.4747	0.4646	0.4733
0.65	0.4151	0.4609	0.4305
0.75	0.3220	0.3160	0.3417
0.85	0.2655	0.2001	0.2194
0.95	0.0678	0.0685	0.0756

and commands are 

> M := ImportData();
> L := convert(M, listlist);
> plot(L, x = 0.5e-1 .. .95, axis[1] = [gridlines = [10, thickness = 2, subticks = false, color = blue]]); 

but am receving error

Error, (in plot) found points with fewer or more than 2 components. Could anyone can help me...

I need graph somewhat like this with exact solution also but am not getting

 this through above commands