Thanks for the replies.
I've reviewed the EPs I have & they seem to provide the range of values described by Les.
I'll prepare a plan for my next session out in the dark & have a crack.
I'll certainly chase down more PNe's. Not an object I've sought out too much.
The current discussions on reports has also served to enthuse to "play, play, play" & seek out detail.
Ta,
Mental.
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