PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/13-15:27:50
G03     230.1          67.8                8.6 +/-    0.34       9.2 +/-    0.34  0.110 / 0.240
G09     303.2          17.5                6.5 +/-    1.34      15.3 +/-    1.34  0.110 / 0.260
G14     98.7           17.3                8.5 +/-    1.57      19.9 +/-    1.57  0.040 / 0.050
G16     124.5          59.3                9.4 +/-    0.67      10.8 +/-    0.67  0.040 / 0.050
G22     189.1          52.3                9.2 +/-    1.02      11.3 +/-    1.02  0.030 / 0.040
G23     322.7          52.6                7.9 +/-    0.59       9.6 +/-    0.59  0.040 / 0.040
G26     67.2           50.4                7.4 +/-    0.78       9.3 +/-    0.78  0.050 / 0.040
G31     52.8           18.0                7.0 +/-    3.39      16.1 +/-    3.39  0.060 / 0.050