PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-23:27:50
G02     203.0          36.5               17.6 +/-    0.86      27.3 +/-    0.86  0.040 / 0.030
G06     158.1          70.0               14.6 +/-    0.67      15.4 +/-    0.67  0.040 / 0.040
G12     307.9          15.7                8.1 +/-    2.80      19.8 +/-    2.80  0.130 / 0.270
G17     32.1           52.4               12.5 +/-    1.19      15.3 +/-    1.19  0.080 / 0.300
G19     0.4            65.3               12.0 +/-    0.82      13.1 +/-    0.82  0.100 / 0.100
G24     297.4          38.3               12.3 +/-    1.62      18.4 +/-    1.62  0.080 / 0.070
G28     103.4          30.4               13.2 +/-    0.75      22.9 +/-    0.75  0.080 / 0.120