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A first try at de-obfuscate the structure, mainly in ./loessf.f :

  ehg182(): warning(message) generator, defined in ./loessc.c
        called from almost any non-trivial function in loessf.f
        and hence *NOT* in the following calling structure


loess()             [R] ../R/loess.R
|
\-> simpleLoess()   [R]
    |
    |-> loess_raw         loessc.c
    |    |
    |    |--> lowess_workspace   "
    |    |    |
    |    |    \--> lowesd
    |    |
    |    |
    |    |--> lowesf
    |    |    |
    |    |    \--> ehg136
    |    |         |
    |    |         \--> ehg127  {fit at one new x}
    |    |              |
    |    |              |--> ehg106 {partial sort (for median etc)}
    |    |              |
    |    |              |--> "LINPACK" [QR,SVD..]
    |    |              |
    |    |              \--> ehg184 {warning}
    |    |
    |    |
    |    |
    |    |
    |    |
    |    |
    |    |--> lowesb
    |    |    |
    |    |    |--> ehg183       {warning}
    |    |    |
    |    |    \--> ehg131
    |    |         |
    |    |         \--> ehg139
    |    |              |
    |    |              |--> ehg127  [see above]
    |    |              |
    |    |              \--> ehg137
    |    |
    |
    |
    |
    |-> loessp






predict.loess()     [R] ../R/loess.R
|
\-> predLoess()     [R]
    |
    \-> loess_raw         loessc.c