PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/05/13-18:27:40
G01     83.5           32.5               12.2 +/-    1.07      20.3 +/-    1.07  0.040 / 0.050
G07     130.2          34.8               14.0 +/-    1.05      22.4 +/-    1.05  0.040 / 0.040
G11     61.9           37.2               13.2 +/-    0.99      20.0 +/-    0.99  0.060 / 0.090
G13     287.7          38.1               14.9 +/-    1.04      22.3 +/-    1.04  0.060 / 0.070
G15     311.0          12.5               11.1 +/-    2.14      29.2 +/-    2.14  0.070 / 0.080
G17     217.7          58.5               13.6 +/-    0.86      15.7 +/-    0.86  0.060 / 0.090
G18     57.0           21.7               11.6 +/-    2.90      24.4 +/-    2.90  0.060 / 0.110
G19     216.4          32.4               13.2 +/-    2.26      22.0 +/-    2.26  0.070 / 0.100
G28     348.5          61.6               12.3 +/-    0.36      13.8 +/-    0.36  0.100 / 0.130
G30     120.5          69.5               13.8 +/-    0.69      14.7 +/-    0.69  0.070 / 0.140