A few things that need to do for making a time series plot with gnuplot:
# set x-axis to display time
set xdata time
# set input format
# Do not use blank to separate them since a blank
# is interpreted as zero, resulting in confusion
# columns to make a plot
set timefmt "%H:%M:%S"
# set output format
set format x "%H:%M:%S"
Refer to timefmt for all other format.
# set x-axis to display time
set xdata time
# set input format
# Do not use blank to separate them since a blank
# is interpreted as zero, resulting in confusion
# columns to make a plot
set timefmt "%H:%M:%S"
# set output format
set format x "%H:%M:%S"
Refer to timefmt for all other format.
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