PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-19:43:10
G01     115.9          20.3               15.9 +/-    1.64      34.7 +/-    1.64  0.100 / 0.180
G07     88.7           65.0               14.5 +/-    0.43      15.8 +/-    0.43  0.100 / 0.220
G08     44.6           31.7               10.8 +/-    1.38      18.3 +/-    1.38  0.080 / 0.110
G09     176.9          22.8               15.3 +/-    1.30      31.4 +/-    1.30  0.060 / 0.070
G11     104.0          41.3               14.5 +/-    0.80      20.7 +/-    0.80  0.170 / 0.300
G13     316.0          21.9               11.4 +/-    1.79      23.9 +/-    1.79  0.110 / 0.200
G17     204.0          24.3               17.7 +/-    1.61      35.2 +/-    1.61  0.030 / 0.030
G18     90.9           22.2               12.4 +/-    1.94      26.0 +/-    1.94  0.030 / 0.030
G28     300.4          58.9               13.5 +/-    1.03      15.5 +/-    1.03  0.040 / 0.040
G30     359.0          72.7               14.4 +/-    0.62      15.0 +/-    0.62  0.030 / 0.040