[gmx-users] gmx order has no output

[Мижээ Батсайхан]

Dear gmx users,

I run heterogeneous membrane simulation which consists of several different
type of lipids. Now I would like to analysis of order parameters.
I used following command for sn-2 order parameters.

gmx order -s ../step7_1.tpr -f ../nopbc.xtc -n sn2.ndx -od deuter_sn2.xvg
-o order-sn2.xvg -d z -nr ../index.ndx

in the result file, only header rows printed, and there is no data as
following

*****************************************
 # Created by:
#                    :-) GROMACS - gmx order, VERSION 5.1 (-:
#
# Executable:   /usr/local/gromacs/5.1.0/bin/gmx
# Data prefix:  /usr/local/gromacs/5.1.0
# Command line:
#   gmx order -s ../step7_1.tpr -f ../nopbc.xtc -n sn2.ndx -od
deuter_sn2.xvg -o order-sn2.xvg -d z -nr ../index.ndx
# gmx order is part of G R O M A C S:
#
# Green Red Orange Magenta Azure Cyan Skyblue
#
@    title "Order tensor diagonal elements"
@    xaxis  label "Atom"
@    yaxis  label "S"
@TYPE xy

*****************************************
Do you have an explain and any suggests, please?

Best regards,
Mijiddorj