position whole measure rest

[Wilbert Berendsen]

Hello, I know that I can position a rest vertically using e.g. d'1\rest .

But how can I alter the vertical position of a whole-measure rest (R1)? I want 
it to move outside the staff, so it should also get a ledger line.

\relative c' <<
        { e2 e4 a } \\
        { R1 }
>>

The R1 is drawn too close to the notes.

TIA,
with best regards,
Wilbert Berendsen

-- 
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whole-rest.png
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