Table 3. Dimensions of VLPs observed in the reactors in comparison to previously documented phage families.

reactor/phage families	Head diameter (nm)			Tail length (nm)
	average	range	STD b	average	range	STD b
daily-fed reactor	66	54 - 96	9.6	162	84 - 289	61.4
hourly-fed reactor	76	55 - 151	22.6	137	87 - 382	51.4
Siphoviridaea	55	40 - 97	--	191	79 - 593	--
Myoviridaea	85	53 - 160	--	167	80 - 485	--

^a251 total phages examined (Ackermann 1998) [32]

^bSTD, standard deviation