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They are both indirect identifiers, which can also be used to communicate with or access the individual. When identification is based only on one of these two identifiers:

• EI=0,25 (Negligible) throughout a country's population when the number/address is not registered in a publicly available register.
• EI=0,5 (Limited) throughout a small city's population and the number/address is not registered in a publicly available register (identification possible through communication).
• EI=1 (Maximum) throughout a country's population and the number/address is included in publicly available register.