PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-04:28:10
G02     209.3          53.8                7.3 +/-    1.41       8.8 +/-    1.41  0.030 / 0.030
G06     107.2          80.6                5.0 +/-    0.50       5.1 +/-    0.50  0.040 / 0.030
G12     315.2          27.3                1.1 +/-    1.72       2.0 +/-    1.72  0.080 / 0.240
G17     49.5           39.0                3.1 +/-    0.47       4.6 +/-    0.47  0.160 / 0.240
G19     29.6           54.4                4.1 +/-    1.02       4.9 +/-    1.02  0.040 / 0.080
G24     278.0          42.1                3.6 +/-    2.13       5.0 +/-    2.13  0.030 / 0.060
G28     117.1          19.2                6.3 +/-    1.42      14.2 +/-    1.42  0.060 / 0.100