PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-12:27:50
G01     234.2          25.2                5.3 +/-    1.41      10.2 +/-    1.41  0.040 / 0.040
G03     304.0          64.3                6.8 +/-    0.70       7.5 +/-    0.70  0.040 / 0.040
G14     76.4           30.5                5.1 +/-    0.88       8.8 +/-    0.88  0.190 / 0.200
G16     157.4          31.6                6.4 +/-    1.33      10.8 +/-    1.33  0.220 / 0.230
G18     208.3          14.0                5.9 +/-    1.95      14.9 +/-    1.95  0.030 / 0.030
G22     238.9          76.7                6.5 +/-    0.44       6.7 +/-    0.44  0.030 / 0.030
G23     299.1          30.2                6.7 +/-    0.76      11.7 +/-    0.76  0.080 / 0.120
G26     120.7          49.7                7.2 +/-    0.73       9.1 +/-    0.73  0.090 / 0.120
G31     41.9           42.7                3.4 +/-    1.20       4.7 +/-    1.20  0.080 / 0.120
G32     88.7           16.7                4.4 +/-    3.12      10.4 +/-    3.12  0.090 / 0.130