[gmx-users] why "gmx gyrate" could not be supplied with "-tu ns" option?

[ZHANG Cheng]

Dear Gromacs,
I use Command line:


  gmx gyrate -s md_0_1.tpr -f md_0_1_noPBC.xtc -o gyrate.xvg -tu ns



and was told:


Error in user input:
Invalid command-line options
    Unknown command-line option -tu



So why "gyrate" could not be supplied with "-tu ns" option?


Thank you.


Yours sincerely
Cheng