PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-17:27:30
G08     308.4          19.3                7.9 +/-    1.33      17.7 +/-    1.33  0.060 / 0.070
G10     333.7          60.2                7.1 +/-    1.01       8.0 +/-    1.01  0.050 / 0.070
G14     219.1          32.4                8.5 +/-    1.61      14.1 +/-    1.61  0.050 / 0.070
G18     44.1           57.5                7.7 +/-    0.61       9.0 +/-    0.61  0.050 / 0.070
G21     135.5          49.9               12.5 +/-    0.72      15.7 +/-    0.72  0.050 / 0.080
G24     73.4           30.4               11.2 +/-    0.49      19.5 +/-    0.49  0.050 / 0.080
G27     271.2          37.3                7.1 +/-    0.95      10.9 +/-    0.95  0.040 / 0.050
G32     224.9          53.0               11.5 +/-    0.94      14.0 +/-    0.94  0.030 / 0.050