[chirp_users] r-tone freq

Hi, I had obtained my original CSV file that I import into different radios, with editions, according to the radio. I was wondering about the r-tone freq column. All of mine are 88.5, and I'm guessing that r-tone is receive tone, which if it is that, I think that I will only hear other radios with the same r-tone frequency. Is this what the r-tone freq is? If so, I will remove all of them. Thanks.

Glenn