Table 1: Basic data for I Zw 1.

${\rm RA}_{2000}$
${\rm00h53m34.9s}$ Falco et al. (1999)
${\rm Dec}_{2000}$ $+12d41\hbox{$^\prime$ }36\hbox{$^{\prime\prime}$ }$ Falco et al. (1999)
${\rm Position\ Angle} $ $135\hbox{$^\circ$ }$ Schinnerer et al. (1998)
${\rm Inclination}$ $(38\pm 5)\hbox{$^\circ$ }$ Schinnerer et al. (1998)
${\rm Redshift}$ 0.0611 Solomon et al. (1997)
${\rm Distance}$ $242\ {\rm Mpc}^{{\rm a}}$  
${\rm Length\ Conversion\ Factor} $ $1 \hbox{$^{\prime\prime}$ }\approx 1.2\ {\rm kpc}$  
$^{{\rm a}}$ H0=75 km s-1 Mpc-1 and q0=0 will be adopted throughout the paper.


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