PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-17:43:10
G01     127.4          10.6               -3.6 +/-   42.88      -9.9 +/-   42.88  0.100 / 0.120
G07     65.8           66.1               13.1 +/-    0.65      14.1 +/-    0.65  0.160 / 0.110
G08     51.2           40.1               10.8 +/-    1.04      15.7 +/-    1.04  0.030 / 0.030
G09     179.1          38.7               14.4 +/-    1.19      21.4 +/-    1.19  0.040 / 0.030
G11     118.2          35.4               14.3 +/-    1.08      22.6 +/-    1.08  0.040 / 0.040
G17     199.2          13.9               12.2 +/-    5.76      31.2 +/-    5.76  0.030 / 0.030
G18     102.7          16.1               13.3 +/-    2.44      32.3 +/-    2.44  0.120 / 0.350
G27     37.5           9.5                 9.6 +/-    1.93      27.0 +/-    1.93  0.100 / 0.290
G28     269.5          48.6               14.2 +/-    2.96      18.2 +/-    2.96  0.180 / 0.360
G30     334.1          61.4               11.8 +/-    0.74      13.3 +/-    0.74  0.110 / 0.250