Initial conditon for filling command in FIDAP

When setting up a single fluid VOF, I specify some cells/elements/continnum to have FILL, CONSTANT=1 using ICNODE command. What do I need to specify for the "EMPTY" space?
You have two choices:

---No ICNODE card, or

---ICNODE (enti="empty_space", fill, ZERO)

If you happen to enter const=0.0, the program interprets this as a FLAG and makes FILL=1 irrespective of the value. The reason is that you can't have partially filled elements.

In PreSTO, empty space is defined as "EMPTY" and then it will write it out as ICNODE(enti=" ", fill, zero) in the FDREAD file.

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