Some of the input parameters of the numerical routines can be modified by the user to optimise their use in special circumstances. However, before changing them it is essential to refer first to the information describing the software. See Ftikreg, Flog, and Contin and references given there for more details. When this editing is allowed (this option is set on the Customise form), then before the file is sent for calculation a form opens automatically and the parameters can be changed. Basically, this form allows the user to set the value of the regularisation parameter. In automatic mode this is found by the software using criteria which are specific to the calculation method being used. WARNING: manipulation of these parameters needs considerable experience and knowledge in relation to how these routines work. It is possible to create error conditions and incorrect data output by ill-advised manipulation of these parameters. See the paragraph on the Tikhonow regularisation method for more details.