PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-18:58:00
G07     9.0            67.3               11.8 +/-    1.03      12.6 +/-    1.03  0.040 / 0.040
G08     70.5           52.1               12.1 +/-    0.82      14.9 +/-    0.82  0.040 / 0.040
G09     181.0          52.6               14.9 +/-    0.85      18.2 +/-    0.85  0.040 / 0.040
G11     133.6          25.6               15.2 +/-    2.36      29.4 +/-    2.36  0.040 / 0.040
G23     158.3          17.6               14.1 +/-    1.54      32.9 +/-    1.54  0.090 / 0.230
G27     41.2           18.3               10.3 +/-    1.88      23.6 +/-    1.88  0.120 / 0.200
G28     256.8          44.4               12.7 +/-    3.47      17.3 +/-    3.47  0.110 / 0.090
G30     320.0          50.5               11.4 +/-    0.34      14.3 +/-    0.34  0.070 / 0.150