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erreur d'observation
gen.	observation error
fin.	disturbance term
math.	error of observation; observational error
stat.	non-sampling error
stat., scient.	ascertainment error
erreur d’observation
chem.	experimental error
erreurs d'observation
gen.	errors of observation

erreur d'observation: 4 phrases in 2 subjects

Astronomy	1
Statistics	3