Geocode   City    z=ln(T2/T1)
1101      Beijing     0.24
1401      Taiyuan     0.26
1402      Datong      0.28
1403      Yangquan    0.19
1404      Changzhi    0.51
1405      Jincheng    0.79
1427      Yuncheng    0.57
2101      Shenyang    0.32
2102      Dalian      0.34
2106      Dandong     0.31
2107      Jinzhou     0.27
3201      Nanjing     0.43
3202      Wuxi        0.54
3203      Xuzhou      0.34
3204      Changzho    0.50
3206      Nantong     0.52
3208      Huaiyin     0.56
3209      Yancheng    0.57
3210      Yangzhou    0.89
3401      Hefei       0.48
3402      Wuhu        0.37
3403      Bengbu      0.35
3404      Huainan     0.32
3408      Anqing      0.35
3421      Fuyang      0.48
3427      Tunxi       0.38
4101      Zhengzho    0.29
4102      Kaifeng     0.25
4103      Luoyang     0.43
4104      Pingding    0.46
4105      Anyang      0.37
4107      Xinxiang    0.60
4128      Zhumadia    0.57
4129      Nanyang     0.39
4201      Wuhan       0.28
4202      Huangshi    0.30
4203      Shiyan      0.41
4204      Shashi      0.37
4222      Xiaogan     0.75
4401      Guangzho    0.41
4402      Shaoguan    0.42
4403      Shenzhen    1.16
4405      Shantou     0.97
4406      Foshan      0.97
4408      Zhanjian    0.75
4425      Huizhou     1.04
4428      Zhaoqing    0.79
5301      Kunming     0.32
5302      Dongchua    0.20
5322      Qujing      0.34
5324      Yuxi        0.61
5325      Gejiu       0.40
5329      Dali        0.39
5330      Baoshan     0.27
6200      Lanzhou     0.22