PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/15-17:28:10
G03     186.3          12.6               12.8 +/-    1.85      33.8 +/-    1.85  0.070 / 0.040
G07     297.7          41.3               10.9 +/-    2.43      15.5 +/-    2.43  0.080 / 0.040
G08     140.1          33.0               11.5 +/-    1.43      18.9 +/-    1.43  0.030 / 0.030
G09     317.0          70.0               10.6 +/-    0.44      11.2 +/-    0.44  0.030 / 0.040
G16     41.7           30.5                9.0 +/-    1.30      15.6 +/-    1.30  0.110 / 0.090
G23     134.6          67.5               11.6 +/-    0.27      12.5 +/-    0.27  0.120 / 0.110
G27     89.2           36.2               11.5 +/-    0.80      17.9 +/-    0.80  0.090 / 0.110
G30     280.3          18.7               11.3 +/-    0.89      25.7 +/-    0.89  0.110 / 0.130