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via curl command
if you want to download the data file from 1st January 2020, type the command :
curl --insecure https://cds-espri.ipsl.fr/iasicl2/iasi_o3/V6.5.1/2020/01/IASI_METOPC_L2_O3_COLUMN_20200101_ULB-LATMOS_ICDR_V6.5.1.nc -O

if you want to download more than one file, type :
curl --insecure https://cds-espri.ipsl.fr/iasicl2/iasi_o3/V6.5.1/2020/01/IASI_METOPC_L2_O3_COLUMN_202001[19-25]_ULB-LATMOS_ICDR_V6.5.1.nc -O