PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-18:12:40
G02     19.8           64.8                9.0 +/-    0.56       9.8 +/-    0.56  0.030 / 0.040
G05     152.1          53.6               12.0 +/-    0.67      14.5 +/-    0.67  0.030 / 0.040
G06     49.9           20.7                6.9 +/-    2.03      14.9 +/-    2.03  0.060 / 0.080
G12     199.8          74.4                9.7 +/-    0.64      10.0 +/-    0.64  0.070 / 0.060
G19     91.3           18.1                8.4 +/-    3.51      19.3 +/-    3.51  0.030 / 0.030
G25     307.0          47.9                9.1 +/-    2.19      11.8 +/-    2.19  0.030 / 0.020
G29     300.3          20.3                9.0 +/-    1.26      19.6 +/-    1.26  0.150 / 0.200