/usr/include/bart/wavelet/wavthresh.h is in libbart-dev 0.4.02-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #include <stdbool.h>
extern const struct operator_p_s* prox_wavelet_thresh_create(unsigned int N, const long dims[N], unsigned int flags, unsigned int jflags, const long minsize[N], float lambda, bool randshift);
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