Fig. 5From: Round robin comparison study on the form measurement of optical freeform surfacesBilateral difference plots for the two-radii specimen: The difference plots between the following five measurements are shown: 1: USTUTT TWI, 2: PTB TWI, 3: Mahr TWI, 4: Mahr MFU, 5: IPP MFU. The plot of row i, column j shows the processed measurement i minus the processed measurement j (pointwise)Back to article page