# Fod2fixel script -crop option not a valid flag
**URL:** https://community.mrtrix.org/t/fod2fixel-script-crop-option-not-a-valid-flag/759
**Category:** Uncategorized
**Created:** [March 1, 2017, 8:17pm UTC](https://community.mrtrix.org/t/fod2fixel-script-crop-option-not-a-valid-flag/759 "2017-03-01T20:17:43Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@jbishop](https://community.mrtrix.org/u/jbishop)
#### Post date: [March 1, 2017, 8:17pm UTC](https://community.mrtrix.org/t/fod2fixel-script-crop-option-not-a-valid-flag/759/1 "2017-03-01T20:17:44Z")
Dear Experts,
I am running the last part of step 7 for the fixel analysis and I am running into an error with the -crop flag. It does not appear to be a valid flag, however, the directions on the utilize it to threshold the .msf file. Is there a new option to threshold the file at 0.2? Any help would be greatly appreciated. Is the -fmls\_peak\_value flag the same thing?
Thanks,
James
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### Author:  [@Dave](https://community.mrtrix.org/u/Dave)
#### Post date: [March 1, 2017, 9:51pm UTC](https://community.mrtrix.org/t/fod2fixel-script-crop-option-not-a-valid-flag/759/2 "2017-03-01T21:51:01Z")
Hi James,
The `-crop` option is part of the `fixelthreshold` command. I’m guessing there must be an issue inside your script?
Cheers,
Dave
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### Author:  [@jbishop](https://community.mrtrix.org/u/jbishop)
#### Post date: [March 1, 2017, 9:58pm UTC](https://community.mrtrix.org/t/fod2fixel-script-crop-option-not-a-valid-flag/759/3 "2017-03-01T21:58:40Z")
Thanks Dave. I definitely just misread the script. I appreciate the help.
James