Rdb

class astropy.io.ascii.Rdb

Bases: Tab

Tab-separated file with an extra line after the column definition line that specifies either numeric (N) or string (S) data.

See: https://www.drdobbs.com/rdb-a-unix-command-line-database/199101326

Example:

col1 <tab> col2 <tab> col3
N <tab> S <tab> N
1 <tab> 2 <tab> 5