Oh certainly, I wasn't suggesting that.

I think it would be appropriate to check the list for detection decrease going down and say "Unknown" below that.

For example, in my 5 year file the mags run like this;

0 - 44857
1 - 150058
2 - 56027
3 - 28411
4 - 38387
5 - 5531
6 - 614
7 - 78
8 - 3
9 - 0

so globally it seems to be good clear down to 1 with an odd dip at 3.

These numbers would vary from region to region so it would be necessary to check each search.

Tedious but possible.

Roger