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via curl command
if you want to download the data file from 1st January 2015, type the command :
curl --insecure https://cds-espri.ipsl.fr/iasial2/iasi_o3/V1.2.1/2015/01/IASI_METOPA_L2_O3_COLUMN_20150101_ULB-LATMOS_CDR_V1.2.1.nc -O

if you want to download more than one file, type :
curl --insecure https://cds-espri.ipsl.fr/iasial2/iasi_o3/V1.2.1/2015/01/IASI_METOPA_L2_O3_COLUMN_201501[19-25]_ULB-LATMOS_CDR_V1.2.1.nc -O