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<img src='content_image/352754.jpg'>

As shown in Fig. 4(a), the cluster width y$_{rms}$ calculated using the model for κ = 2 . 4 and r 0 = 1 . 25 mm exhibits excellent agreement with the experimental data, including reproduc- ing the transition between the zigzag and elliptical configurations. The agreement between the measured and predicted values of x$_{rms}$ provides a cross check on the model. We find that the predicted values of x$_{rms}$ [Fig. 4(b)] show good agreement for α 2 ≲ 4, but system- atically underestimate the measured cluster length as α 2 increases. For the longest clusters, which are in a straight line configuration, the predicted cluster lengths are about 6% below 

