PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-18:27:50
G01     113.9          20.8                9.8 +/-    1.20      21.3 +/-    1.20  0.050 / 0.050
G07     99.4           57.6               11.2 +/-    0.98      13.0 +/-    0.98  0.040 / 0.060
G08     43.1           26.6                7.8 +/-    2.52      14.7 +/-    2.52  0.040 / 0.040
G09     176.9          22.2               10.7 +/-    1.72      22.3 +/-    1.72  0.040 / 0.030
G11     98.2           42.1               10.2 +/-    0.75      14.4 +/-    0.75  0.030 / 0.040
G13     314.6          24.2                8.1 +/-    1.19      16.0 +/-    1.19  0.030 / 0.040
G17     202.3          30.1               10.9 +/-    1.35      19.0 +/-    1.35  0.110 / 0.210
G18     86.6           22.3                9.4 +/-    1.69      19.6 +/-    1.69  0.090 / 0.200
G28     294.7          56.6               10.1 +/-    1.29      11.9 +/-    1.29  0.090 / 0.170
G30     3.2            74.1               10.7 +/-    0.89      11.1 +/-    0.89  0.070 / 0.200