PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-23:27:20
G02     203.0          36.5               17.8 +/-    1.29      27.5 +/-    1.29  0.130 / 0.410
G06     158.1          70.0               14.7 +/-    0.88      15.6 +/-    0.88  0.180 / 0.340
G12     307.9          15.7                9.0 +/-    2.17      21.9 +/-    2.17  0.060 / 0.090
G17     32.1           52.4               11.5 +/-    0.80      14.1 +/-    0.80  0.070 / 0.080
G19     0.4            65.3               11.6 +/-    0.85      12.6 +/-    0.85  0.060 / 0.090
G24     297.4          38.3               13.0 +/-    1.14      19.4 +/-    1.14  0.050 / 0.090
G28     103.4          30.4               13.9 +/-    0.81      24.1 +/-    0.81  0.080 / 0.150