PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/17-19:27:50
G01     107.6          24.7               12.2 +/-    2.21      24.0 +/-    2.21  0.030 / 0.040
G07     109.2          53.0               11.6 +/-    0.94      14.2 +/-    0.94  0.030 / 0.040
G08     41.8           20.4                9.4 +/-    3.28      20.6 +/-    3.28  0.180 / 0.300
G09     175.7          15.8               12.5 +/-    1.87      30.6 +/-    1.87  0.220 / 0.270
G11     88.5           42.9               13.4 +/-    0.99      18.7 +/-    0.99  0.050 / 0.060
G13     310.0          28.8                9.1 +/-    1.01      16.3 +/-    1.01  0.060 / 0.060
G17     204.5          37.5               12.2 +/-    0.62      18.5 +/-    0.62  0.070 / 0.140
G18     79.0           23.6               11.0 +/-    1.09      22.2 +/-    1.09  0.090 / 0.150
G28     307.3          58.9               10.0 +/-    1.69      11.4 +/-    1.69  0.040 / 0.030
G30     26.5           78.0               11.2 +/-    1.33      11.4 +/-    1.33  0.050 / 0.030