Points > Ordered Sample (applicable to ordered data only) reduces the number of cells by a ratio.
Sampling field (1/4, 1/9, 1/16, 1/25, 1/36, 1/49, 1/64, 1/81, or 1/100) - specifies a degree of reduction.
OK button - saves the sampled object to the Model Manager and closes the dialog.
Cancel button - terminates the dialog without saving the sampled ordered point object to the Model Manager.