A hydrographic percentage is obtained by rolling 2D-7 and adding the planet’s atmosphere, some atmospheres use the modifier listed below instead.

Size 0 or 1: Hydrographic 0

Atmosphere 0, 1, A, B or C: DM-4

Question : if Atmosphere 0, 1, A, B or C is the roll then 2D-7 + Atmos & then DM-4

or if Atmosphere 0, 1, A, B or C it's then 2D + Atmos and then DM-4

or Atmosphere 0, 1, A, B or C its then 2D & DM-4

Cheers in advance