netCDF files

Hi All,

I downloaded sentinel-3 data from https://scihub.copernicus.eu/dhus/ and I obtained the following files:
enhanced_measurement.nc
reduced_measurement.nc
standard_measurement.nc

Then I try to open the file in linux with the following command:
ncdump -h standard_measurement.nc | more

However, it gives me an error as follows:
ncdump: standard_measurement.nc: NetCDF: Unknown file format

Did I miss something?

I do not think my netCDF has a problem as it works well with other files which are not from https://scihub.copernicus.eu/dhus/

Thank you very much.