text: micrometers. Pinning of the contact line and thermal Marangoni effects are often mentioned as 
  
  necessary conditions for the ring formation. The contact line pinning is often assumed to result 
  
  from substrate heterogeneities. Film height and concentration proﬁles at various instants during 
  
  the dewetting process are displayed in Fig. 7. The proﬁles are from before, at and after self-pinning 
  
  of the contact line. In Fig. 8 we display a space-time plot for the complete process. At ﬁrst, the 
  
  front recedes in the same manner as when there is no evaporation, but now driven by convection 
  
  and evaporation. A small capillary rim forms that collects all the dewetted liquid that does not 
  
  evaporate. The particle concentration slowly increases at the contact line (Fig. 7(a) and regime 