Exp Fluids (2004) DOI 10.1007/s00348-004-0824-0

Due to an unfortunate error Fig. 1 was published incorrectly. The correct figure is printed below.

Fig. 1
figure 1

Schematic diagram of the experimental setup for DPIV measurement of a more viscous fluid 2 displaced by a less viscous fluid 1 in a vertical cylindrical tube