Fig. 2From: Assessment of GNSS zenith tropospheric delay responses to atmospheric variables derived from ERA5 data over NigeriaMean ERA5 atmospheric data collected over the study area from 2014 to 2016 a surface pressure (Pa) b relative Humidity (%) @ 1000 (hPa) c specific humidity (kg/kg) @ 1000Â hPa d 2Â m Dew point Temperature (K) e PWV (mm) f Temperature (K) @ 1000Back to article page