XYArrayItemTyperepresents a vector of XVType values like a list of peaks, where XVType.x is the position of the peak and XVType.value is its intensity. XYArrayItemTypeis formally defined in Table 10.

Table 10– XYArrayItemType definition

Attribute	Value
BrowseName	XYArrayItemType
IsAbstract	False
ValueRank	1
DataType	XVType (defined in 5.6.8)
References		NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ArrayItemType defined in 5.3.4.1
HasProperty		Variable	XAxisDefinition	AxisInformation	PropertyType	Mandatory

The Valueof the XYArrayItemcontains an array of structures (XVType) where each structure specifies the position for the X-Axis (XVType.x) and the value itself (XVType.value), used for the Y-Axis. Engineering units and range for the Valueare defined by corresponding Propertiesinherited from the ArrayItemType.

XAxisDefinition Propertyholds the information about the Engineering Unitsand Rangefor the X-Axis.

The axisSteps of XAxisDefinitionshall be set to NULL because it is not used.

The StatusCode SemanticsChangedbit shall be set if any of the InstrumentRange, EURange, EngineeringUnits, Title orXAxisDefinition Propertiesare changed (see 5.2for additional information).