PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/31-14:27:40
G01     70.4           32.9                5.9 +/-    1.10       9.7 +/-    1.10  0.030 / 0.030
G07     137.6          30.7                7.2 +/-    0.74      12.4 +/-    0.74  0.030 / 0.030
G11     52.9           29.8                6.1 +/-    1.81      10.8 +/-    1.81  0.080 / 0.060
G13     273.8          37.6                7.3 +/-    2.55      11.0 +/-    2.55  0.070 / 0.070
G15     304.9          13.8                3.8 +/-    1.00       9.7 +/-    1.00  0.040 / 0.100
G17     234.2          70.0                7.5 +/-    0.36       8.0 +/-    0.36  0.040 / 0.100
G18     48.5           17.8                5.8 +/-    2.71      13.5 +/-    2.71  0.060 / 0.080
G19     224.2          39.1                8.3 +/-    2.54      12.3 +/-    2.54  0.060 / 0.060
G28     19.8           59.3                7.2 +/-    1.90       8.2 +/-    1.90  0.110 / 0.180
G30     135.9          62.8                7.4 +/-    0.50       8.2 +/-    0.50  0.110 / 0.210