PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/21-15:27:40
G10     297.6          52.2                5.9 +/-    0.92       7.3 +/-    0.92  0.030 / 0.040
G14     209.9          12.1                4.0 +/-   16.59      10.6 +/-   16.59  0.030 / 0.040
G15     46.3           29.2                3.1 +/-    0.87       5.6 +/-    0.87  0.030 / 0.040
G20     352.4          65.4                3.5 +/-    1.09       3.8 +/-    1.09  0.040 / 0.040
G21     101.8          70.9                6.0 +/-    0.80       6.3 +/-    0.80  0.090 / 0.140
G24     93.3           25.9                9.0 +/-    0.51      17.3 +/-    0.51  0.090 / 0.160
G27     303.1          32.4                5.9 +/-    1.19       9.8 +/-    1.19  0.130 / 0.430
G32     210.6          30.7                7.4 +/-    2.17      12.7 +/-    2.17  0.110 / 0.490