PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/21-20:27:50
G01     254.9          37.4                9.4 +/-    2.26      14.3 +/-    2.26  0.070 / 0.090
G03     316.5          40.4                7.6 +/-    1.59      10.9 +/-    1.59  0.060 / 0.080
G11     238.6          13.5                9.8 +/-    2.17      25.2 +/-    2.17  0.060 / 0.100
G14     57.1           42.3                8.4 +/-    1.56      11.8 +/-    1.56  0.070 / 0.100
G18     219.7          29.0                9.4 +/-    2.38      16.8 +/-    2.38  0.180 / 0.500
G22     308.3          62.7                8.1 +/-    0.65       9.0 +/-    0.65  0.140 / 0.480
G23     283.3          15.6                9.0 +/-    1.65      22.0 +/-    1.65  0.070 / 0.070
G26     142.3          34.1               10.0 +/-    0.99      16.1 +/-    0.99  0.050 / 0.080
G31     42.1           66.6                7.8 +/-    0.66       8.4 +/-    0.66  0.250 / 0.540
G32     73.7           25.9                8.0 +/-    1.16      15.4 +/-    1.16  0.140 / 0.440