Table 3.

Information of 15 metropolises.

City name	Population (${10}^4$)	Longtitude	Latitude	Initial confirmed cases	$t_{free}$
Beijing	2154	116.41	39.90	44	0
Shanghai	2428	121.47	31.23	20	1
Guangzhou	1531	113.26	23.13	7	0
Shenzhen	1344	114.06	22.54	15	0
Chengdu	1658	104.07	30.57	7	1
Hangzhou	1036	120.16	30.27	6	2
Chongqing	3124	106.55	29.56	54	1
Wuhan	1121	114.31	30.59	495	1
Xian	1000	108.94	34.34	2	2
Tianjin	1562	117.20	39.08	5	1
Nanjing	850	118.80	32.06	3	2
Zhengzhou	1035	113.63	34.75	3	2
Changsha	839	112.94	28.23	8	0
Shenyang	832	123.43	41.81	2	2
Qingdao	950	120.38	36.07	3	2