typedef struct {
     icStandardObserver            stdObserver;          /* Standard observer */
     icXYZNumber                   backing;              /* XYZ for backing material */
     icMeasurementGeometry         geometry;             /* Measurement geometry */
     icMeasurementFlare            flare;                /* Measurement flare */
     icIlluminant                  illuminant;           /* Illuminant */
 } icMeasurement;