rey-hex hourly traffic in percent of capacity 2021-07-26

/data/traffic/plot/plot-hr -n rey-hex -d 2021-07-26 -t traffic -f png  >/data/traffic/html/imgs/hr.traffic.rey-hex.2021-07-26.png
Illegal division by zero at /data/traffic/plot/plot-hr line 97.
Plot failed, ret = 255