PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-20:27:50
G01     107.5          25.4               14.5 +/-    2.40      28.1 +/-    2.40  0.100 / 0.160
G07     105.8          59.1               16.1 +/-    1.01      18.5 +/-    1.01  0.090 / 0.100
G08     42.5           24.4               10.3 +/-    2.07      20.5 +/-    2.07  0.100 / 0.170
G09     175.4          14.6               17.8 +/-    0.96      44.8 +/-    0.96  0.120 / 0.180
G11     91.9           43.2               14.0 +/-    1.12      19.3 +/-    1.12  0.070 / 0.130
G13     310.2          28.0               12.7 +/-    1.11      23.3 +/-    1.11  0.080 / 0.130
G17     207.0          32.8               17.2 +/-    1.57      28.5 +/-    1.57  0.040 / 0.020
G18     81.4           24.3               14.2 +/-    1.55      28.2 +/-    1.55  0.040 / 0.010
G28     317.8          61.0               13.7 +/-    0.82      15.4 +/-    0.82  0.030 / 0.010
G30     31.4           78.1               16.0 +/-    0.75      16.3 +/-    0.75  0.030 / 0.010