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**Help with printing a string**

I have a theoretical plot for the fresnel diffration pattern, however i want maple to show the values plotted on the x and y cordinates. How do i do this. Please explain in simple terms

heres my code

Code:

```
> fresdi:= proc(a,b) (FresnelC(a) - FresnelC(b))^2 + (FresnelS(a) - FresnelS(b))^2 end;
fresdi := proc(a, b)
(FresnelC(a) - FresnelC(b))^2 + (FresnelS(a) - FresnelS(b))^2
end proc;
> v:=1.48;
v := 1.48
> umin:=-6; umax:=6;
umin := -6
umax := 6
> plot( fresdi(u-(v/2),u+(v/2)), u=umin..umax,title=cat(`Fresnel diffraction from slits of width v=`,
> convert(v,string)), axes=boxed, labels=[`Distance across diffraction plane, u`,`I(u)`]);
```

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