PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-22:42:40
G01     221.4          12.1                8.9 +/-    1.79      23.7 +/-    1.79  0.050 / 0.040
G03     265.2          70.1                8.6 +/-    0.90       9.1 +/-    0.90  0.050 / 0.040
G09     298.1          11.5               -1.9 +/-   29.64      -5.2 +/-   29.64  0.040 / 0.050
G14     92.9           19.8                8.7 +/-    2.23      19.2 +/-    2.23  0.040 / 0.040
G16     144.8          50.6               11.4 +/-    0.67      14.2 +/-    0.67  0.090 / 0.160
G22     204.4          64.7                8.8 +/-    0.37       9.7 +/-    0.37  0.120 / 0.140
G23     312.3          42.0                7.5 +/-    1.00      10.5 +/-    1.00  0.160 / 0.230
G26     86.5           55.2                9.0 +/-    0.82      10.7 +/-    0.82  0.330 / 0.240
G31     47.6           27.8                5.8 +/-    2.15      10.6 +/-    2.15  0.130 / 0.240