how to specify plotting axises in simulink?

i have this code generated in "Matlab function" block in simulink:

if true
  function pfa1 = fcn(c,p,t)
    T=0:0.5:32
    pfa1=exp(-(T.*t./p).^(c/2))
   end
end

now when i use the "scope" block it automatically plots "pfa1" against "t" -t is set to be the time-, i want to plot "pfa1" against "T" how can i do that?

I've used the "XY" plotting block and set T to be an output alongside with pfa1 and used them both as inputs for XY block but i got dimension error

[Birdman]

what are inputs c,p,t and their sizes?

[Fatma Abdullah]

they are constants be "constant" block

c=2 p=1 and t is the time which is represented by "clock" block