length of the path traversed by the recording device between the extreme chart scale lines, when the recording device is moved in the direction of one of the two axes, meeriku poolt läbitud tee pikkus diagrammi äärmiste skaalajoonte vahel, kui meerikut liigutatakse kahest võimalikust teljest ühe telje suunas, length of the path (curved or straight) traversed by the marking device between the extreme chart scale lines, when the chart-driving mechanism is stationary