[GRASS-user] help with r.hants

Hello community!

I would like to ask a little help for a brand new 7 GRASS module: r.hants.
In this module there are some option that can be chosen. One of them is:

fet=float - Fit error tolerance

Anyway in the manual there is no explanation about how to use this option, that actually seems to be quite useful.
I would like to know how to use it. Should this error tolerance be indicated as a percentage?

Thanks a lot to whoever could help me and greetings to everyone else!

Leonardo Sandon