PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-21:28:00
G01     40.6           15.8               11.0 +/-    1.59      26.9 +/-    1.59  0.070 / 0.160
G06     176.6          37.0               15.3 +/-    1.27      23.5 +/-    1.27  0.060 / 0.110
G13     236.5          22.3               16.8 +/-    1.29      34.9 +/-    1.29  0.130 / 0.360
G15     269.8          12.2               15.9 +/-    1.51      42.2 +/-    1.51  0.130 / 0.270
G17     3.9            70.0               13.4 +/-    0.62      14.2 +/-    0.62  0.040 / 0.080
G19     277.8          69.5               13.5 +/-    0.62      14.3 +/-    0.62  0.040 / 0.070
G24     315.9          20.3               13.6 +/-    2.16      29.6 +/-    2.16  0.080 / 0.080
G28     67.3           50.0               11.7 +/-    1.02      14.8 +/-    1.02  0.070 / 0.090
G30     154.2          25.7               15.0 +/-    1.26      28.9 +/-    1.26  0.140 / 0.290