Question: 1-D box, supressing output

Hi, Im trying to show the first few energy levels of a particle in a 1-D box. The plots are looking how i want them to look, but i can't stop it from producing loads of unwanted code. It seems to have been produced from P1 and P2 and putting a colon after them doesn't supress the output.

Can anyone see how i can stop the blue code from being shown and keep the plots?

I cant get the picture of the code to upload so if anyone has maple 9 (the one i'm using) maybe you could copy and paste the code? -or alternatively the code screenshot can be viewed as a jpg at http://postimage.org/image/hsseodpg/

thanks

restart;

a:=1;

with(plots):

for n from 1 by 2 to 3

do;

P1:=plot(sqrt(a)*cos((n*Pi*x)/2*a)+1,x=-a..a,y=0..2,style=line):

P2:=plot([[[-a,0],[-a,10]],[[a,0],[a,10]]],x=-a..a,y=0..2,colour=blue):

display({P1,P2},scaling=constrained,title=`wavefunction`);

od;