UI design - what is the best way to allow the user to set some kind of infusion at varying (non periodic) times?

I want to allow the user to specify a curve like this:
Such that some subVI outputs the value A2 when a time variable is within the range R1, A1 when the time variable is within the range R2, and A3 when the time is within the range R3.
My design looks something like this:
With error checking that looks like this:
My question is, is the array based approach optimal? How else could I tackle this?

I think I can summarize the conversation to this point as an answer to the original question (What is the best way ...) -- before starting to write any code, think carefully about what you want to accomplish, and write it down (otherwise known as "Write the Documentation First").  One of the points of a good User Interface is that it doesn't allow users to "make silly mistakes" -- it leads the user "by the hand", restricting the entries to "legal values" and requiring that entries be made in a logical manner.
So if you were going to have a list of Infusions to enter, it makes sense to decide on whether to enter Time Intervals (which are always >0) or Times (which, logically) are always in ascending order.  You can (and should) decide which you want (or you could have a control that would let the User decide, but that might be too flexible) and then enforce your "rules".
Suppose you decided on "Intervals" (which seems, to me, to be more User Friendly).  After the User has entered the intervals (and you've provided a nice plot of Infusion vs Time), you could allow the User to "split" an Interval, "Remove" an Interval, or "Edit the Infusion" of an Interval, or you could decide to have a simpler "Accept or Start Over" choice -- if you only have a few intervals, the last might be the simplest (and thus the Best) Design Choice.
Spending more time thinking before coding usually pays Big Dividends!
Bob (speaking from Sad Experience) Schor

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    Option to include additional fields in structure VBAPKOM (communication fields for maintaining a sales item)
    USEREXIT_MOVE_FIELD_TO_VBEPKOM
    Option to include additional fields in structure VBEPKOM (communication fields for maintaining a sales document schedule line)
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    USEREXIT_MOVE_FIELD_TO_KOMPH
    You can use this user exit to include new fields for batch determination (document item).
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    FXVBUV (Incompletion)
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    User exits in the screens
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    User Exits in Program MV45AFZ4
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    USEREXIT_MOVE_FIELD_TO_KOMP
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    Regards
    Eswar

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