PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-22:43:10
G01     39.3           13.2                8.6 +/-    0.91      22.3 +/-    0.91  0.130 / 0.390
G02     199.1          13.1               20.7 +/-    3.58      53.8 +/-    3.58  0.080 / 0.410
G06     173.7          44.1               15.3 +/-    0.87      21.0 +/-    0.87  0.080 / 0.140
G13     234.5          19.2               14.8 +/-    1.53      33.2 +/-    1.53  0.070 / 0.180
G15     267.0          10.8               10.9 +/-    2.80      30.0 +/-    2.80  0.100 / 0.360
G17     358.4          69.8               10.9 +/-    0.71      11.5 +/-    0.71  0.090 / 0.380
G19     288.9          70.1               10.6 +/-    0.73      11.2 +/-    0.73  0.040 / 0.080
G24     315.0          22.6                6.8 +/-    1.76      14.1 +/-    1.76  0.040 / 0.080
G28     77.6           44.4               10.7 +/-    0.64      14.6 +/-    0.64  0.090 / 0.190
G30     155.2          21.8               15.1 +/-    2.32      31.8 +/-    2.32  0.090 / 0.160