A showerhead facilitating draining of water retained following shut-off. The blue primary color \u201cBlue\u201d in the standard RGB gamut is mapped to a point that has moved in the clockwise direction, and that color is taken to be the primary color \u201cBlue-s\u201d in the Standard mode gamut. A set of images of the standard may be collected and compiled to develop standard data, such as average of median values, that can be used to test imaging apparatus. The control logic may be configured to determine a rate of change of the impedance of a target tissue based on the feedback signal received from the electrosurgical end effector.