This process has been discussed many mnay times.
Distill everything out before 97c, then collect your nitro at 101c
It's not dangerous as some may claim, and if you take your time, you will have high purity nitro.
You can, if you want, leave the nitro exposed to the air in hopes of evaping away the drop or two of meoh/azetrope that may have been left in the condensor you neglected to clean before collecting your next fraction..
& I'm, somethin of a phenom, no need for da cron, I'm un-stopable.