PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/27-23:58:00
G07     338.1          59.7                7.0 +/-    0.37       8.0 +/-    0.37  0.090 / 0.110
G08     95.1           52.9                9.1 +/-    0.66      11.1 +/-    0.66  0.100 / 0.130
G09     189.9          70.8               11.0 +/-    0.69      11.6 +/-    0.69  0.070 / 0.060
G11     145.2          14.6               10.5 +/-    2.32      26.5 +/-    2.32  0.060 / 0.100
G23     156.4          37.5               11.7 +/-    0.70      17.8 +/-    0.70  0.030 / 0.040
G27     51.3           29.1                6.8 +/-    2.28      12.1 +/-    2.28  0.030 / 0.040
G28     240.5          33.0                8.6 +/-    1.39      14.2 +/-    1.39  0.030 / 0.050
G30     307.1          40.5                7.8 +/-    1.38      11.2 +/-    1.38  0.030 / 0.040