PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/21-14:58:00
G02     212.4          51.1               10.9 +/-    0.94      13.5 +/-    0.94  0.060 / 0.070
G06     78.3           77.9                9.4 +/-    0.35       9.6 +/-    0.35  0.060 / 0.060
G12     315.8          30.2                7.8 +/-    1.80      13.7 +/-    1.80  0.040 / 0.060
G17     49.6           38.9                8.6 +/-    1.19      12.7 +/-    1.19  0.060 / 0.070
G19     33.6           51.9                8.4 +/-    2.18      10.4 +/-    2.18  0.040 / 0.040
G24     274.8          41.8               10.8 +/-    2.03      15.2 +/-    2.03  0.050 / 0.050
G28     116.0          24.1                8.6 +/-    1.85      17.1 +/-    1.85  0.030 / 0.020