Question about image widget in Phoebus

[Florian Feldbauer via Tech-talk <tech-talk at aps.anl.gov>]

Hey all,

we are operating pixel sensors and as a kind of QA / status monitor we 
would like to display the hit distribution of the pixel sensor in phoebus.
So in principal I need a 2D histogram.
The Image widget in Phoebus looks like it could be usable for it, but so 
far I was not able to operate it.
Is there some documentation on the different widget types and their 
properties?
The image widget has a "PV name" propertie, but also
Cursor info PV
Cursor X PV
Cursor Y PV

What is the meaning of these PVs?
What kind of PVs can be used?

Many thanks for your help in advance,
Florian

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AG der Experimentalphysik I
Dr. Florian Feldbauer
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