[O III] 5007 Å line widths as a function of (a) the infrared luminosities and (b) the IRAS flux density ratios ﹩f_{25}/ f_{60}﹩. Filled squares represent Seyfert 1 galaxies. Other symbols are as in Fig. 5. The objects with large [O III] line widths generally have large infrared luminosities, and many of them have Seyfert optical characteristics and warm IRAS colors.