PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-18:43:00
G01     94.8           30.7               16.1 +/-    1.01      27.7 +/-    1.01  0.060 / 0.080
G07     121.6          49.4               17.5 +/-    0.58      22.2 +/-    0.58  0.070 / 0.100
G08     42.1           12.7               10.6 +/-    3.12      27.9 +/-    3.12  0.030 / 0.020
G11     74.4           41.7               14.9 +/-    1.17      21.1 +/-    1.17  0.030 / 0.020
G13     299.1          34.5               13.8 +/-    1.95      22.1 +/-    1.95  0.040 / 0.040
G17     212.5          46.5               15.9 +/-    0.71      21.0 +/-    0.71  0.040 / 0.040
G18     68.2           24.6               14.1 +/-    1.71      27.8 +/-    1.71  0.070 / 0.120
G19     213.1          22.1               16.5 +/-    1.65      34.6 +/-    1.65  0.060 / 0.140
G28     341.7          61.9               13.8 +/-    0.45      15.5 +/-    0.45  0.040 / 0.060
G30     90.3           77.8               16.9 +/-    0.34      17.2 +/-    0.34  0.030 / 0.070