Fig. 10
From: Testing of a new Yb:YAG fiber laser system for the removal of graphic vandalism from marble
Typical trend of heating/cooling behaviour (point) with data fitting (red line). The plot is referred to FB graffiti paintings with operative mode G. T∞ is the asymptotic behaviour of the heat induced by laser radiation on the surface, and it indicates the maximum temperature value that is reached at infinity; tR is the increase of surface temperature over ambient temperature, induced by laser radiation