use the x-data range to indicate the x-axis labels
German translation: x-Achsen Beschriftung
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Explanation: You don't give much context to go on, but I assume this is in the field of data processing. A label, acc. to Ferretti, is a "Datenblock auf Magnetschichtspeichern zur Markierung und Sicherung von Dateien". Brinkmann, Wörterbuch der Daten- und Kommunikationstechnik, also gives "Etikett". Other terms are Kennsatz, Dateietikett, Marke. Maybe one of these will fit into your overall context.