vim fold: how to avoid the "+--" marks

experts:

a question about vim fold:

I can fold these:

a

    b

        c

        d

e

into :

a

    b

+--  2 lines: c

e

I just wonder, how to avoid displaying the "+--", and just leave it as:

a

    b

    2 lines: c

e

sometime this looks "cleaner" for me... especially if I need to refer the folded text in other docs...

any idea?

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