PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/15-17:57:30
G07     7.1            66.0                9.8 +/-    0.62      10.7 +/-    0.62  0.030 / 0.040
G08     77.6           51.4               10.2 +/-    0.67      12.7 +/-    0.67  0.040 / 0.040
G09     183.8          62.3               12.4 +/-    0.95      13.8 +/-    0.95  0.120 / 0.140
G11     136.8          21.6               11.9 +/-    1.62      25.1 +/-    1.62  0.090 / 0.150
G23     158.7          30.0               12.1 +/-    0.97      21.1 +/-    0.97  0.030 / 0.030
G27     46.9           26.1                8.9 +/-    1.90      17.0 +/-    1.90  0.030 / 0.040
G28     245.4          34.3               10.8 +/-    1.99      17.4 +/-    1.99  0.150 / 0.170
G30     312.3          44.4                9.7 +/-    0.60      13.2 +/-    0.60  0.100 / 0.130