Fig. 10From: Round robin comparison study on the form measurement of optical freeform surfacesRMS values of difference maps for the convex toroidal specimen. The RMS values of the pointwise differences of the following five measurements are shown: 1: USTUTT TWI, 2: PTB TWI, 3: Mahr TWI, 4: Mahr MFU, 5: IPP MFU. The value of row i, column j shows the RMS value for the pointwise differences of measurement i and measurement jBack to article page