1. A method of data processing in relation to a touch-sensing apparatus, wherein the touch-sensing apparatus is operable to generate projection signals representing radiation that has propagated on a plurality of propagation paths across a touch surface of a panel such that a touching object on the touch surface causes attenuation of at least one of the projection signals, said method comprising: generating a peak corresponding to the touching object on the touch surface by image reconstruction processing of the projection signals; generating, as a function of a time series of magnitude values, a time series of force values representing an application force of the touching object onto the touch surface, a current force value in the time series of force values calculated as a function of a current magnitude value among the magnitude values and a current speed of the touching object; detecting, based on the current speed, that the touching object is in a low speed state; and applying a duration-based modification function to the current magnitude value to counteract a gradual increase in attenuation with time for the touching object.