PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-16:43:10
G07     325.9          56.2               12.6 +/-    0.63      14.9 +/-    0.63  0.100 / 0.160
G08     115.5          46.9               16.5 +/-    0.87      21.6 +/-    0.87  0.090 / 0.130
G09     250.9          82.7               13.6 +/-    0.90      13.7 +/-    0.90  0.040 / 0.060
G16     43.4           19.2                9.9 +/-    0.93      22.2 +/-    0.93  0.040 / 0.060
G23     150.7          53.7               15.8 +/-    0.80      19.1 +/-    0.80  0.130 / 0.310
G27     69.4           36.9               12.9 +/-    0.57      19.8 +/-    0.57  0.140 / 0.250
G28     228.5          16.2               16.5 +/-    1.86      39.9 +/-    1.86  0.090 / 0.290
G30     293.9          29.3               11.3 +/-    1.56      20.1 +/-    1.56  0.090 / 0.240