PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-17:13:10
G07     43.9           69.9               11.3 +/-    0.87      11.9 +/-    0.87  0.030 / 0.050
G08     53.7           43.4                9.9 +/-    1.21      13.7 +/-    1.21  0.030 / 0.050
G09     178.5          38.7               12.3 +/-    0.80      18.3 +/-    0.80  0.040 / 0.050
G11     121.8          33.7               11.5 +/-    1.10      18.7 +/-    1.10  0.040 / 0.060
G18     106.4          15.4               11.2 +/-    1.50      27.6 +/-    1.50  0.030 / 0.040
G28     272.9          51.8               12.1 +/-    1.43      14.9 +/-    1.43  0.040 / 0.040
G30     331.2          59.1                9.3 +/-    0.69      10.6 +/-    0.69  0.080 / 0.120