Range measured: level 0, sky region +365760..+388880, 23120 bytes, read as
2890 records of 8. The matched-control autocorrelation puts the peak at
stride 8 (0.217 real, 0.000 shuffled), so 8 is the unit to describe.
Composition: 1185 distinct u32 values across 5780 words; a mean of 6.99 of
every 8 bytes are zero, so most records are sparse; and 549 of 2890 adjacent
pairs, 19%, are exact duplicates of each other. The most common 8-byte record
appears 283 times and is d7d7d780 d7d7d780 -- a 4-byte value stored twice.
Others follow the same shape: 00051980 00051980, 00082580 00082580.
Not decoded. Sparsity with repeated entries is what a keyframe or index table
looks like, but nothing here establishes that, and the duplicated-4-byte shape
may just as easily be two adjacent records sharing a value.
Recorded as a characterisation with its range rather than a finding, because
that is what it is. The useful part is that the next attempt does not have to
re-derive the composition to know whether a decode is plausible.
ReaperOfVeriod
3855169d48