Hovmueller Plot, minor ticks disappear..

Hi NCL users,

Anybody can give me a hint how to turn on the minor ticks in the
Hovmöller plot. I did the setting like this but It is still not working:

  res@tmYLMode = "Explicit"
  res@tmYLMinorOn = True
  res@tmYLValues = origData&time(::15)
  res@tmYLLabels = ut_string(origData&time(::15),"%d %c")

then i change the script as follow by calling the tTick.ncl:

  resTick = True
  resTick@ttFormat = "%d %c"
  resTick@ttAxis = "YL"
  resTick@ttMajorStride = 15
  tTick( origData&time, res, resTick )

I got this error:

fatal:Variable (time_at_units) is undefined
fatal:Execute: Error occurred at or near line 156 in file ./tTick.ncl

fatal:Execute: Error occurred at or near line 133

Thanks

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• application/octet-stream attachment: tTick.ncl