Fog cop not working

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Hello
I rendered an EXR sequence with “shading depth (Pz)” extra image plane.
In the image viewer, in the top right drop down, I can select my Pz plane.
In Hou 18, in Composite view, in the top right drop down, I cannot see my Pz plane.
I the img context, I chose a file node with my exr sequence, then I output it inside a fog node. When I move all sliders, jothing happens. Also what I find strange is that there is no option to set the white and black point, like in the image viewer.

Thanks for the help.
DS
Houdini gamboler
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Update: I re-rendered the EXR, but this time I changed an option :
In the mantra render node > tab images > tab output > quantization = 32 bit float
So now the Pz image plane is available in the composite AND the fog works
Houdini gamboler
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