PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-21:12:50
G01     37.9           11.1               10.8 +/-    2.47      29.5 +/-    2.47  0.040 / 0.060
G02     199.3          14.2               15.5 +/-    5.45      39.3 +/-    5.45  0.040 / 0.060
G06     175.1          43.9               12.1 +/-    0.93      16.5 +/-    0.93  0.080 / 0.150
G13     231.5          18.1               13.2 +/-    2.60      30.5 +/-    2.60  0.080 / 0.180
G17     13.6           65.2               10.6 +/-    0.91      11.5 +/-    0.91  0.130 / 0.270
G19     298.5          71.5               10.1 +/-    0.63      10.6 +/-    0.63  0.140 / 0.200
G24     313.4          25.1               10.2 +/-    1.54      20.0 +/-    1.54  0.130 / 0.320
G28     75.6           47.1               12.1 +/-    0.80      15.8 +/-    0.80  0.110 / 0.250
G30     155.4          19.5               14.0 +/-    2.86      31.2 +/-    2.86  0.060 / 0.060