PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/21-15:27:50
G10     297.6          52.2                6.5 +/-    1.98       7.9 +/-    1.98  0.030 / 0.030
G14     209.9          12.1                1.9 +/-   19.17       5.1 +/-   19.17  0.030 / 0.030
G15     46.3           29.2                5.2 +/-    1.58       9.3 +/-    1.58  0.100 / 0.040
G20     352.4          65.4                6.3 +/-    0.49       6.8 +/-    0.49  0.090 / 0.050
G21     101.8          70.9                8.3 +/-    0.97       8.7 +/-    0.97  0.100 / 0.130
G24     93.3           25.9                9.7 +/-    1.00      18.6 +/-    1.00  0.110 / 0.100
G27     303.1          32.4                5.1 +/-    0.79       8.5 +/-    0.79  0.130 / 0.560
G32     210.6          30.7                7.6 +/-    0.96      13.1 +/-    0.96  0.140 / 0.520