A not-so-terse bonus cache Mystery Cache
A not-so-terse bonus cache
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Difficulty:
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Terrain:
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Size: 
(small)
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in our disclaimer.
The cache is not at the published coordinates.
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A bonus cache for those who have looked at my Terse series. For details of all the series, see GCYJW6 which is now sadly archived. You can access this cache through the link below. Two of the caches have been retitled since then.
(visit link)
The unusual twist is that you don't need to have found all 11 of the Terse puzzles in order to do this one!
Being a nerdy scientist in my day job I like to see lawful-looking relationships such as the one depicted in the following graph:-
(visit link)
Your task is to understand the above graph and this will lead you, via a simple process, to a number, X.
The coordinates for the cache are:
N 51 Y, W 000 Z
where Y = X/371557
and Z = X/240792
If you contact me with your values for Y and Z, I will naturally confirm whether they are correct. There is no writing implement in this cache.
Additional Hints
(Decrypt)
ybbx ng gur k nkvf; ubj znal qngn cbvagf ner gurer?