PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/13-22:27:30
G02     199.5          16.8               12.4 +/-    2.20      29.6 +/-    2.20  0.080 / 0.160
G06     175.3          46.0               12.7 +/-    1.24      16.9 +/-    1.24  0.110 / 0.130
G13     229.7          16.4               13.1 +/-    1.48      31.5 +/-    1.48  0.050 / 0.060
G17     17.7           62.8               11.6 +/-    0.76      12.9 +/-    0.76  0.050 / 0.070
G19     306.4          71.6               11.0 +/-    0.55      11.6 +/-    0.55  0.100 / 0.310
G24     312.0          27.3                8.4 +/-    2.02      15.6 +/-    2.02  0.270 / 0.320
G28     79.0           45.6               11.7 +/-    0.80      15.7 +/-    0.80  0.120 / 0.170
G30     156.1          17.7               12.6 +/-    1.89      29.2 +/-    1.89  0.110 / 0.180