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Optical sectioning profiles of the standard HRME (no slit) and confocal HRME (20, 40, 60, 80, and 100-pixel slit). The line scanning confocal configurations significantly improve the axial resolution of the standard HRME. As the slit size increases, the axial performance transits from the confocal to nonconfocal regime. A 20-pixel slit on the CMOS sensor is about on the fiber surface.
