/usr/lib/erlang/releases/RELEASES.src is in erlang-src 1:15.b.1-dfsg-4+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | [{release,"OTP APN 181 01","R15B01","5.9.1",
[{kernel,"2.15.1","%ERL_ROOT%/lib/kernel-2.15.1"},
{stdlib,"1.18.1","%ERL_ROOT%/lib/stdlib-1.18.1"},
{sasl,"2.2.1","%ERL_ROOT%/lib/sasl-2.2.1"}],
permanent}].
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