PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-17:13:10
G07     345.2          61.9                9.9 +/-    0.75      11.1 +/-    0.75  0.080 / 0.150
G08     96.7           51.6               11.9 +/-    0.49      14.8 +/-    0.49  0.090 / 0.170
G09     193.8          74.1               11.0 +/-    1.30      11.4 +/-    1.30  0.030 / 0.050
G11     144.2          14.6               11.1 +/-    2.22      27.8 +/-    2.22  0.040 / 0.060
G23     155.8          41.1               12.6 +/-    0.87      18.0 +/-    0.87  0.070 / 0.080
G27     55.9           32.5                8.8 +/-    0.60      14.7 +/-    0.60  0.060 / 0.080
G28     236.4          25.9               11.9 +/-    1.04      22.8 +/-    1.04  0.050 / 0.080
G30     303.4          37.0               10.0 +/-    0.91      15.3 +/-    0.91  0.050 / 0.090