PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/06-19:27:50
G01     99.0           29.2               15.8 +/-    1.32      28.1 +/-    1.32  0.130 / 0.220
G07     117.3          52.6               12.8 +/-    0.37      15.6 +/-    0.37  0.090 / 0.220
G08     42.0           16.5                9.7 +/-    2.01      23.3 +/-    2.01  0.030 / 0.040
G11     79.8           42.7               14.2 +/-    1.05      19.8 +/-    1.05  0.030 / 0.040
G13     303.0          32.7                9.5 +/-    0.93      15.7 +/-    0.93  0.030 / 0.030
G17     210.5          42.0               13.5 +/-    0.78      19.0 +/-    0.78  0.030 / 0.030
G18     72.4           24.9               13.6 +/-    1.00      26.6 +/-    1.00  0.110 / 0.110
G19     211.7          18.9               12.3 +/-    1.70      27.9 +/-    1.70  0.100 / 0.090
G28     334.2          61.8               11.5 +/-    0.26      12.8 +/-    0.26  0.040 / 0.040
G30     72.8           78.9               12.5 +/-    1.07      12.7 +/-    1.07  0.050 / 0.040