PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/20-15:12:40
G01     43.9           20.1                7.0 +/-    2.14      15.4 +/-    2.14  0.090 / 0.210
G06     175.5          32.3               11.9 +/-    1.22      19.9 +/-    1.22  0.080 / 0.200
G13     242.0          26.7                8.5 +/-    2.10      16.0 +/-    2.10  0.030 / 0.030
G15     276.6          14.1                6.1 +/-    0.99      15.6 +/-    0.99  0.030 / 0.040
G17     332.0          76.2                8.1 +/-    0.61       8.4 +/-    0.61  0.040 / 0.050
G19     261.4          66.8                9.8 +/-    0.90      10.6 +/-    0.90  0.040 / 0.060
G24     318.1          13.4                5.7 +/-    1.65      14.7 +/-    1.65  0.040 / 0.040
G28     55.4           54.0                8.1 +/-    0.93       9.8 +/-    0.93  0.040 / 0.050
G30     152.4          33.0                8.3 +/-    1.02      13.7 +/-    1.02  0.150 / 0.340