ATLAS ITk Pixel quad module test-beam measurements

For the HL-LHC upgrade, the current tracking system of the ATLAS experiment will be replaced by an all-silicon system, called the Inner Tracker (ITk), consisting of an inner Pixel Detector and an outer Strip Detector. The ITk Pixel Detector has two types of modules foreseen: triplet modules with 3D sensors in the innermost layer, and quad modules with planar sensors in the other layers. In 2021, for the first time the properties of quad modules were measured in test-beams. The data reconstruction and analysis was optimised to properly account for the non-uniform pixel matrix of the sensors. This talk presents the ATLAS ITk Pixel Detector test-beam data analysis together with the properties of the quad modules, concentrating on the hit efficiency and the spatial resolution.