PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-14:58:00
G01     76.5           33.3                7.0 +/-    1.16      11.5 +/-    1.16  0.030 / 0.030
G07     134.5          35.4                7.7 +/-    1.02      12.1 +/-    1.02  0.030 / 0.030
G11     56.9           33.4                7.2 +/-    2.01      11.8 +/-    2.01  0.070 / 0.060
G13     280.4          37.9                6.6 +/-    1.67      10.0 +/-    1.67  0.060 / 0.070
G15     308.8          12.6                6.0 +/-    1.28      15.8 +/-    1.28  0.080 / 0.110
G17     225.9          64.8                8.5 +/-    0.95       9.3 +/-    0.95  0.060 / 0.140
G18     52.7           20.2                6.3 +/-    6.63      13.7 +/-    6.63  0.070 / 0.080
G19     220.8          34.6                8.8 +/-    1.59      14.1 +/-    1.59  0.080 / 0.070
G28     10.7           60.3                8.6 +/-    1.70       9.7 +/-    1.70  0.180 / 0.380
G30     129.4          67.5                7.9 +/-    0.70       8.4 +/-    0.70  0.370 / 0.340