PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/12/20-20:27:30
G01     228.2          21.5               11.5 +/-    1.94      24.5 +/-    1.94  0.040 / 0.030
G03     302.9          62.1                9.4 +/-    0.59      10.5 +/-    0.59  0.030 / 0.030
G14     77.9           31.7                9.5 +/-    1.86      16.0 +/-    1.86  0.080 / 0.120
G16     149.5          38.5               12.5 +/-    0.61      18.6 +/-    0.61  0.090 / 0.150
G22     241.3          74.3               10.1 +/-    0.51      10.5 +/-    0.51  0.070 / 0.080
G23     302.0          32.2                8.9 +/-    2.02      15.0 +/-    2.02  0.050 / 0.110
G26     110.5          52.1                9.3 +/-    0.32      11.5 +/-    0.32  0.040 / 0.040
G31     43.1           38.9                7.7 +/-    1.02      11.4 +/-    1.02  0.040 / 0.050