[Gmsh] file format

[oka]

Dear developer,

I am not familiar with gmsh file format.
In my partitioed mesh case,
One file (total 4 partitions) shows as follows.
- - - - 
21586 4 4 0 1 1 1 790 148 5726 6827
21587 4 5 0 1 2 1 -4 5004 1004 4710 7455
21588 4 4 0 1 1 1 3280 2145 3283 8302
- - - - 
For example. for element number 21587,
what is the meaning of following numbers,
5 0 1 2 1 -4 
especially, why extra -4 appears although other
elements has no minus values ?

Best regards,

Oka

-- 
oka <oka at bpe.es.osaka-u.ac.jp>