PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-23:57:50
G02     204.4          41.0               14.0 +/-    2.28      20.0 +/-    2.28  0.090 / 0.130
G06     149.6          74.1               13.6 +/-    0.67      14.1 +/-    0.67  0.130 / 0.170
G12     310.2          18.9                8.9 +/-    1.90      20.1 +/-    1.90  0.060 / 0.080
G19     9.4            62.7                9.9 +/-    0.74      11.1 +/-    0.74  0.040 / 0.080
G24     292.4          40.1               10.3 +/-    0.94      14.9 +/-    0.94  0.090 / 0.200
G28     107.4          27.5               12.4 +/-    2.16      22.9 +/-    2.16  0.070 / 0.170