PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/31-14:28:10
G01     69.9           32.8                6.2 +/-    0.89      10.2 +/-    0.89  0.030 / 0.040
G07     137.9          30.3                6.9 +/-    2.01      12.1 +/-    2.01  0.030 / 0.030
G11     52.6           29.5                6.0 +/-    0.55      10.7 +/-    0.55  0.040 / 0.070
G13     273.2          37.6                8.1 +/-    1.22      12.2 +/-    1.22  0.040 / 0.070
G15     304.5          13.9                5.5 +/-    1.91      14.1 +/-    1.91  0.060 / 0.140
G17     235.2          70.4                8.1 +/-    0.79       8.5 +/-    0.79  0.060 / 0.140
G18     48.1           17.5                4.4 +/-    0.97      10.3 +/-    0.97  0.040 / 0.050
G19     224.5          39.5                9.3 +/-    1.61      13.6 +/-    1.61  0.030 / 0.050
G28     20.6           59.2                7.5 +/-    0.41       8.5 +/-    0.41  0.050 / 0.130
G30     136.4          62.4                9.1 +/-    0.76      10.2 +/-    0.76  0.050 / 0.130