PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/21-08:58:00
G01     100.3          27.5                3.7 +/-    1.11       6.8 +/-    1.11  0.030 / 0.030
G07     114.4          52.7                5.2 +/-    0.44       6.4 +/-    0.44  0.030 / 0.040
G08     41.8           18.4                2.7 +/-    2.49       6.1 +/-    2.49  0.050 / 0.070
G11     83.5           44.3                5.3 +/-    0.92       7.2 +/-    0.92  0.040 / 0.060
G13     304.7          32.8                2.0 +/-    2.36       3.2 +/-    2.36  0.250 / 0.260
G17     207.5          40.7                5.4 +/-    0.86       7.8 +/-    0.86  0.240 / 0.290
G18     74.3           24.7                4.6 +/-    1.28       9.1 +/-    1.28  0.080 / 0.160
G19     209.3          19.3               -0.9 +/-    6.64      -2.1 +/-    6.64  0.080 / 0.140
G28     312.9          59.1                3.7 +/-    0.83       4.3 +/-    0.83  0.050 / 0.030
G30     38.4           80.2                4.4 +/-    0.63       4.5 +/-    0.63  0.040 / 0.020