PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-18:27:50
G07     58.6           67.1               11.0 +/-    0.56      11.8 +/-    0.56  0.040 / 0.030
G08     52.8           41.5               10.1 +/-    0.93      14.3 +/-    0.93  0.050 / 0.020
G09     179.3          41.1               13.4 +/-    0.59      19.1 +/-    0.59  0.200 / 0.320
G11     120.5          34.1               12.7 +/-    0.96      20.5 +/-    0.96  0.310 / 0.340
G17     198.9          12.0                9.5 +/-   22.42      25.3 +/-   22.42  0.090 / 0.070
G18     104.6          14.9               11.4 +/-    2.39      28.5 +/-    2.39  0.090 / 0.060
G23     160.6          11.0               13.0 +/-    2.90      35.3 +/-    2.90  0.150 / 0.140
G27     38.1           11.5                9.5 +/-    1.53      25.6 +/-    1.53  0.160 / 0.080
G28     266.6          47.4               12.9 +/-    3.85      16.9 +/-    3.85  0.040 / 0.040
G30     330.8          59.1               10.4 +/-    0.69      11.9 +/-    0.69  0.030 / 0.040