[ROOT] plotting variables from an ntuple, different results

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Hello,

following problem with root 3.01

I have a large NTuple with values r, z, phi, .... called 'map'

if I plot

'map.Draw("r:z","z>-500&&z<200")' and

'map.Draw("r:z","z>-500&&z<200&&phi==0")'

the resulting range in 'z' is different! the first results in z<80 but the
other has z<150.

How can restricting the selection of plotted points make the range larger
??

==========================================================================
Achim Franz       Achim@bnl.gov         http://www.phenix.bnl.gov/~afranz/
BNL, Physics Dept., Bld 510C, Upton, New York, 11973-5000, USA
Tel.: +1 631 344 4750; Fax: +1 631 344 3253
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