How to filter the scorings for a specific isotope

Dear FLUKA experts,
I simulated carbon ion beam beating PMMA target, and I wanted to get the spatial distribution of the designated product (11C, 10C, 15O). I tried to use USRBIN to count, but I could only get the distribution of all heavy ions. Please give me some advice on how to set it.

Thanks in advance.

Dear @akimikko ,

you can use an AUXSCORE card to filter based on the atomic and mass number of the isotopes. You will need to use separate USRBIN and AUXSCORE cards for each isotope you are interested in.