a (the) parametre called "width"

[maque]

If I describe some coding to a person and say: "If you look at the file, you can see that there's a (the) parameter called "width".

My question is: do I use "a" or "the"?
Say, it is the only "width" parameter.

 

[ilcigno]

I don't think it makes a huge amount of difference, but my natural inclination would be to say "a" , maybe because (I assume) there are other parameters (though this is the only "width").

 

[maque]

Thanks, Ilcigno.

 

[brian]

a