Ok, you're trying to convert a number of liters to Gigaliters.
First we need to know the conversion factor between them. 1 Gigaliter = 1 billion liters = 109 liters
So now we can do the conversion:
9.5 liters x (1 Gigaliter / 109 liters)
The 'liters' units cancel and we're left with
9.5 / 109 Gl
This is the same as
9.5 x 10-9 Gl