PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-22:27:40
G02     200.7          25.8               11.7 +/-    2.16      22.4 +/-    2.16  0.080 / 0.110
G06     172.1          56.5               12.9 +/-    1.16      15.1 +/-    1.16  0.090 / 0.120
G13     223.0          10.3               12.9 +/-    2.34      35.8 +/-    2.34  0.040 / 0.090
G17     27.8           55.5               10.3 +/-    0.57      12.2 +/-    0.57  0.050 / 0.100
G19     337.9          69.9               10.3 +/-    0.53      10.9 +/-    0.53  0.040 / 0.040
G24     305.6          33.7                9.6 +/-    1.49      15.7 +/-    1.49  0.060 / 0.050
G28     90.1           40.6               11.3 +/-    0.43      16.3 +/-    0.43  0.030 / 0.030