PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/21-15:12:40
G01     42.8           18.8                5.7 +/-    3.40      13.0 +/-    3.40  0.030 / 0.020
G06     175.1          34.3                9.3 +/-    0.70      14.9 +/-    0.70  0.020 / 0.030
G13     240.3          25.5                7.6 +/-    1.59      14.6 +/-    1.59  0.210 / 0.290
G15     274.9          13.6                5.1 +/-    1.09      13.2 +/-    1.09  0.240 / 0.310
G17     338.7          75.3                8.0 +/-    0.43       8.2 +/-    0.43  0.040 / 0.060
G19     266.1          68.0                8.2 +/-    0.95       8.8 +/-    0.95  0.030 / 0.060
G24     317.7          15.0                3.8 +/-    1.54       9.4 +/-    1.54  0.060 / 0.090
G28     58.3           53.2                7.3 +/-    0.94       8.9 +/-    0.94  0.060 / 0.080
G30     153.0          31.1                8.7 +/-    1.41      14.8 +/-    1.41  0.040 / 0.040