How to omit tuplet range indicator

[Venus' Wink]

Hi,

Under some condition, at both sides of number attached tuplet,
letter-L-like lines are put to indicate the range of the tuplet,
you know.

How could I omit them?

For example:

\version "2.18.2"
\relative c' {

    c8 \tuplet 3/2 {d16 e f}
}

yields output.png of the attachments.

I would like to get purpose.png.

Thanks
Venus' Wink

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output.png
Description: PNG image

purpose.png
Description: PNG image