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Given the two following RSSI vectors sample (given as an array of N=4 values of RSSI
received by a mobile terminal, or an Access Point AP, from AP_1 … AP_N:[-55.0 ;-33.0 ;-78.5 ;-61] and [-58.0 ;-32.0 ;-77.0 ;-59.5]. What is the RSSI distance between both samples ?