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The experimental nuclear reaction database EXFOR contains almost no covariance data because most experimentalists provide experimental data only with uncertainties. With the tool described here a user can construct an experimental covariance matrix from uncertainties using general assumptions when uncertainty information given in EXFOR is poor (or even absent). The tool is publically available in the IAEA EXFOR Web retrieval system .doi:10.1051/epjconf/20122700009 fatcat:gdrk2cgtbvgpvoydfidize4zea