[gradsusr] GEOS-5 dust extinction

[AMS EmsiWx Bytča]

Dear Grads users,

I am trying to plot Europe Dust Extinction using GEOS-5 dods server:

http://opendap.nccs.nasa.gov:9090/dods/GEOS-5/fp/0.25_deg/fcast/inst3_3d_ext_Np/inst3_3d_ext_Np.20160422_00.info

and using duext.

What I would like to get is a map similiar to this: 
https://www.facebook.com/severeweatherEU/videos/1802390916650668/

What I get is an image, please see the attachment.

I dont know how to set the value range. Is there any other way to 
display dust over Europe?

Thank you all very much for your time.


Kindest regards,

Marian, Slovakia
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