 avoid floating point error when pz is larger than e
 avoid floating point error when pz is larger than e

ALICEHLT/AliRoot,ALICEHLT/AliRoot,shahor02/AliRoot,sebaleh/AliRoot,miranov25/AliRoot,coppedis/AliRoot,miranov25/AliRoot,coppedis/AliRoot,sebaleh/AliRoot,sebaleh/AliRoot,miranov25/AliRoot,shahor02/AliRoot,alisw/AliRoot,shahor02/AliRoot,alisw/AliRoot,miranov25/AliRoot,alisw/AliRoot,sebaleh/AliRoot,ALICEHLT/AliRoot,alisw/AliRoot,coppedis/AliRoot,coppedis/AliRoot,ALICEHLT/AliRoot,shahor02/AliRoot,ALICEHLT/AliRoot,sebaleh/AliRoot,sebaleh/AliRoot,sebaleh/AliRoot,alisw/AliRoot,miranov25/AliRoot,ALICEHLT/AliRoot,shahor02/AliRoot,alisw/AliRoot,coppedis/AliRoot,coppedis/AliRoot,miranov25/AliRoot,alisw/AliRoot,miranov25/AliRoot,shahor02/AliRoot,miranov25/AliRoot,shahor02/AliRoot,ALICEHLT/AliRoot,alisw/AliRoot,coppedis/AliRoot,coppedis/AliRoot