Isobar map

[temr]

In petrel if you want vertical slicing
use following formula
temp_pressure=if(k=4,pressure,U)
where
temp_pressure - new pressure property
pressure = your initial pressure property
k is k index of your array
so what it will do is creating property of exact k index so you do not need to use filter
then you can make map of the pressure for any layer you want
And then you can write the macro which will create all maps on the fly - but this is other story my friend