Phobos midrapidity pseudorapidity densities versus centrality.  Au+Au at 19.6 GeV

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19.6GeV data - EOct Centrality Method (combined statistical and systematic errors)
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X-Sect	|	Npart	Error	|	dN/dEta	Error	|	dN/dEta/(Npt/2)	Error
40-45	|	73.9	6.2	|	59.3	4.5	|	1.61		0.18
45-50	|	58.0	5.5	|	45.3	3.4	|	1.56		0.19
50-55	|	44.9	4.8	|	34.8	2.6	|	1.55		0.20
55-60	|	33.8	3.9	|	26.2	2.0	|	1.55		0.22


more central data can be found here:

http://www.bnl.gov/phobos/Publications/Physics/AuAu_19_200_tracklet/20GeV_Basic.txt