S PROJ     SESS B    MJD       MPM       DUR NOBS C
   0 4    DDGBT    1 2  56007  59395000  21610000    1 0 DDGBT_0001.ses
   1 4    DDGBT    2 4  56007  59395000  21610000    1 0 DDGBT_0002.ses