PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/13-16:27:50
G03     186.3          15.6                9.7 +/-    1.88      23.7 +/-    1.88  0.180 / 0.100
G07     297.5          44.1               10.7 +/-    3.72      14.6 +/-    3.72  0.210 / 0.100
G08     138.4          30.5               12.5 +/-    1.10      21.7 +/-    1.10  0.250 / 0.300
G09     319.6          64.5               10.3 +/-    0.90      11.3 +/-    0.90  0.220 / 0.220
G16     43.0           39.9                8.1 +/-    1.60      11.8 +/-    1.60  0.060 / 0.080
G23     123.5          77.2                9.9 +/-    0.61      10.2 +/-    0.61  0.060 / 0.080
G26     44.2           11.7                8.3 +/-    2.89      22.4 +/-    2.89  0.130 / 0.270
G27     98.5           34.8               11.9 +/-    0.75      19.0 +/-    0.75  0.170 / 0.370
G30     276.4          15.5                9.1 +/-    2.58      22.3 +/-    2.58  0.040 / 0.040