Specifying datatype in ASCII data files

[ross]

Suppose I have the following ASCII data file:

VARIABLES = "X" "Y" "Z"
ZONE
DT = ("DOUBLE" "DOUBLE" "DOUBLE")
1. 2. 3.
4. 5. 6.

Are there any other ways to specify the datatype if I have several repeating variables? I tried syntax such as (3"DOUBLE") or 3("DOUBLE") with no luck. Alternatively, if there is any way to specify them all as double, that would work too.