Satisfying result :
- Transform indices from file to absolute time :
# The data of interest are in the first column of event_index.txt
# The time-step in my original file is 3 hours
gmt math -o0 -foT -C0 event_index.txt 3 MUL 3 SUB --TIME_EPOCH=1980-01-01 --TIME_UNIT=h = test.txt
- Plot the annual frequency histogram centered on winter :
# First month is August, the last is July
gmt begin test01 png
gmt histogram -R-5/7/0/20 -JX10c test.txt -T1 -BWSen -Bxa1Of1O+l"Months" -Byaf+l"Frequency"+u"%" -D+r -Z1 -wa -Glightblue -Wthinnest,black --FORMAT_TIME_PRIMARY_MAP=c
gmt end
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