# Some questions about input
**URL:** https://festim.discourse.group/t/some-questions-about-input/179
**Category:** User Support
**Tags:** festim2
**Created:** [August 10, 2026, 8:49am UTC](https://festim.discourse.group/t/some-questions-about-input/179 "2026-08-10T08:49:52Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@yafeng-lab](https://festim.discourse.group/u/yafeng-lab)
#### Post date: [August 10, 2026, 8:49am UTC](https://festim.discourse.group/t/some-questions-about-input/179/1 "2026-08-10T08:49:52Z")
Hello, I am glad that PFC-TT has some amazing optimizations. I have some puzzles to ask.
What is the role of mode in input.cvs.
I understand that S. area parent bin (m^2), surface area (m^2) and f (ion flux scaling factor) exist to correct the actual flux, but I wonder what these parameters should be set according to. I can’t get relevant information from the SOLPS data.
Auto\_binning is an important code connecting SOLPS and PFC-TT, but bin\_index is generated in the file Binned\_Flux\_Data.dat mapped\_fw\_bins\_coords.dat new\_bins\_coords.dat respectively, causing trouble for the correspondence of R, Z and flux data
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### Author:  [@remidm](https://festim.discourse.group/u/remidm)
#### Post date: [August 10, 2026, 12:18pm UTC](https://festim.discourse.group/t/some-questions-about-input/179/2 "2026-08-10T12:18:51Z")
Hi @yafeng-lab I think since this is less of a FESTIM question and more a PFC-TT / HISP question that @AdriaLlealS would be able to answer here