PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/19-12:57:50
G01     320.4          13.6                2.2 +/-    1.92       5.7 +/-    1.92  0.040 / 0.040
G08     266.0          15.4                4.9 +/-    1.18      12.2 +/-    1.18  0.030 / 0.040
G10     71.1           56.2                3.8 +/-    0.63       4.5 +/-    0.63  0.220 / 0.360
G11     309.3          18.5                4.5 +/-    2.75      10.3 +/-    2.75  0.200 / 0.330
G14     276.8          67.1                5.7 +/-    0.85       6.1 +/-    0.85  0.040 / 0.070
G27     226.9          11.7                4.8 +/-    2.41      12.8 +/-    2.41  0.050 / 0.060
G31     176.1          37.7                5.9 +/-    0.95       8.9 +/-    0.95  0.030 / 0.020
G32     359.6          70.3                4.4 +/-    0.35       4.6 +/-    0.35  0.030 / 0.020