PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/19-10:27:50
G01     314.1          27.3                3.9 +/-    1.19       7.2 +/-    1.19  0.070 / 0.170
G10     95.3           45.4                4.3 +/-    1.30       5.8 +/-    1.30  0.120 / 0.110
G11     291.4          27.1                4.6 +/-    2.17       8.6 +/-    2.17  0.040 / 0.040
G14     333.9          70.7                3.4 +/-    1.28       3.6 +/-    1.28  0.040 / 0.040
G18     289.9          48.6                5.9 +/-    4.09       7.6 +/-    4.09  0.040 / 0.040
G20     114.2          21.0                2.9 +/-    1.67       6.2 +/-    1.67  0.050 / 0.050
G22     307.3          22.7                3.6 +/-    1.91       7.3 +/-    1.91  0.030 / 0.020
G25     90.9           12.8                3.7 +/-    1.55       9.8 +/-    1.55  0.040 / 0.020
G31     173.4          53.4                6.3 +/-    0.55       7.7 +/-    0.55  0.080 / 0.120
G32     16.2           63.1                3.6 +/-    0.53       3.9 +/-    0.53  0.060 / 0.110