Table 1: The basic properties of the 27 combined spectra. Columns (1)-(6) refer to the counting number, the label for the mass bin (marked in Fig. 1), the mass bin, the average EW([O  II]$\lambda $3727) of the sample galaxies in each bin, the total number of the galaxies, and the number of the selected spectra to be combined (about half) in each bin, respectively.
(1) (2) (3) (4) (5) (6)
No. Label Mass bin EW([O  II]) Total Selected
    (log M*) average (Å) number number
1 m87 <8.7 -78.72 378 149
2 m871 8.7-8.8 -73.73 339 158
3 m881 8.8-8.9 -71.53 533 228
4 m891 8.9-9.0 -65.51 797 341
5 m901 9.0-9.1 -62.24 1227 533
6 m911 9.1-9.2 -60.42 1470 593
7 m921 9.2-9.3 -57.76 1885 766
8 m931 9.3-9.4 -55.02 2428 1029
9 m9405 9.40-9.45 -52.80 1329 552
10 m94505 9.45-9.50 -51.31 1478 627
11 m9505 9.50-9.55 -50.41 1670 705
12 m95505 9.55-9.60 -48.14 1746 751
13 m9605 9.60-9.65 -46.58 1920 814
14 m96505 9.65-9.70 -45.11 2001 837
15 m9705 9.70-9.75 -43.72 2156 906
16 m97505 9.75-9.80 -42.17 2262 951
17 m9805 9.80-9.85 -40.21 2428 1010
18 m98505 9.85-9.90 -38.31 2841 1020
19 m9905 9.90-9.95 -35.94 2552 1025
20 m99505 9.95-10.0 -33.59 2605 1048
21 m10005 10.0-10.05 -33.22 2750 1076
22 m100505 10.05-10.10 -31.19 2814 1120
23 m1011 10.10-10.20 -29.12a 5860 2145
24 m1021 10.20-10.30 -26.28a 6004 1813
25 m1031 10.30-10.40 -23.79a 6084 1417
26 m1041 10.40-10.50 -22.18a 5973 1148
27 m1051 10.50-10.60 -20.72a 5341 846
a For the massive galaxies with log(M*)>10.10, we select those with stronger [O  II] emission-lines with EW([O  II])< -30 Å for spectral combination.

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