There are several discrepancies between the IRSC style in the repository and the current standards (https://www.int-res.com/journals/guidelines-for-authors/guidelines-authors/), so I'm trying to update the csl file. I changed et al. to not be italicized and updated the et-al limits so they only show first author for in-text citations. However, I need help figuring out how to have "&" between 2 or more authors for in-text citations but no symbol or text between authors in the bibliography. I think the current style is using the same macro for both, but I also can't determine if the and parameter can be set to blank or left empty.

Thanks for any help.