6.4.1 Internal Comparison

The internal comparisons of the spectroscopy are summarized in Table  and shown in Figure  (not Mgb and ${ <{\rm Fe}>}$). The spectra used for the internal comparison have in general lower S/N than the rest - that is why these galaxies were reobserved. The rms scatter for the line indices is higher than expected due to remanence and signal from cosmic-ray events surviving in the spectra.

 

Table: Internal Comparison of the Spectroscopy

Parameter	N	mean		rms
$cz_{\rm hel}$	11	3.2	$$	4.3	14.3
${\log\sigma}$	11	-0.014	$$	0.011	0.036
${ {\rm Mg}_2}$	6	-0.017	$$	0.006	0.015
Mgb	11	-0.110	$$	0.138	0.457
${ <{\rm Fe}>}$	11	-0.101	$$	0.113	0.374

 

Notes: ``rms'' is the root mean square standard deviation. The uncertainty on the mean has been calculated as rms/$\sqrt{N}$.