Consider some string parameters: `Par1`, `Par2`, `Par3`. Could you please tell me how to compose a filename string of the form:

   ` filename="experiment-Par1_number-Par2_position-Par3.dat" `

For the data: e.g.,

    Par1="Exp";
    Par2="11";
    Par3="End";

the filename would be:

    filename="experiment-Exp_number-11_position-End.dat"