Table 4: Means and RMSs of emission-line flux ratios of the galaxies in sample Ca.

Oxygen abundance		 log R23 log $\frac{F([{\rm NII}]\lambda6584) }{F({\rm H}\alpha)}$ log $\frac{F([{\rm OIII}]\lambda5007)}{F([{\rm NII}]\lambda6584)}$ log $\frac{F([{\rm NII}]\lambda6584) }{F([{\rm OII}]\lambda3727)}$ log $\frac{F([{\rm NII}]\lambda6584) }{F([{\rm SII}]\lambda6720)}$ log $\frac{F([{\rm OIII}]\lambda5007)}{F([{\rm OII}]\lambda3727)}$

$8.15 \leq 12 + {\rm log (O/H)} < 8.25$		 0.835 -1.138 1.102 -1.196 -0.532 -0.089
  (0.043) (0.081) (0.171) (0.077) (0.042) (0.140)
$8.25 \leq 12 + {\rm log (O/H)} < 8.35$ 0.825 -1.031 0.936 -1.113 -0.480 -0.191
  (0.053) (0.077) (0.187) (0.082) (0.038) (0.170)
$8.35 \leq 12 + {\rm log (O/H)} < 8.45$ 0.817 -0.934 0.768 -1.056 -0.444 -0.283
  (0.060) (0.088) (0.199) (0.084) (0.033) (0.174)

$8.45 \leq 12 + {\rm log (O/H)} < 8.55$		 0.805 -0.851 0.644 -0.985 -0.397 -0.309
  (0.061) (0.119) (0.237) (0.102) (0.034) (0.184)
$8.55 \leq 12 + {\rm log (O/H)} < 8.65$ 0.772 -0.812 0.572 -0.910 -0.334 -0.329
  (0.052) (0.101) (0.216) (0.091) (0.047) (0.170)
$8.65 \leq 12 + {\rm log (O/H)} < 8.75$ 0.711 -0.689 0.300 -0.780 -0.238 -0.466
  (0.052) (0.083) (0.188) (0.084) (0.051) (0.147)
$8.75 \leq 12 + {\rm log (O/H)} < 8.85$ 0.637 -0.596 0.060 -0.642 -0.146 -0.573
  (0.052) (0.068) (0.160) (0.075) (0.051) (0.135)
$8.85 \leq 12 + {\rm log (O/H)} < 8.95$ 0.559 -0.516 -0.159 -0.508 -0.053 -0.663
  (0.058) (0.058) (0.139) (0.077) (0.052) (0.120)
$8.95 \leq 12 + {\rm log (O/H)} < 9.05$ 0.454 -0.447 -0.383 -0.345 0.054 -0.731
  (0.071) (0.056) (0.123) (0.088) (0.057) (0.108)
$9.05 \leq 12 + {\rm log (O/H)} < 9.15$ 0.324 -0.415 -0.591 -0.174 0.171 -0.777
  (0.084) (0.052) (0.126) (0.100) (0.057) (0.101)
$9.15 \leq 12 + {\rm log (O/H)} < 9.25$ 0.168 -0.398 -0.706 0.016 0.286 -0.758
  (0.074) (0.056) (0.192) (0.085) (0.044) (0.118)
a Mean and RMS of each emission-line flux ratio are given in the upper
and lower rows. RMSs are given in parenthesis.

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