Figure 4 .

Concentration at the surface effect on (a) and (b) for<a onClick="popup('http://www.boundaryvalueproblems.com/content/2013/1/77/mathml/M151','MathML',630,470);return false;" target="_blank" href="http://www.boundaryvalueproblems.com/content/2013/1/77/mathml/M151">View MathML</a>,<a onClick="popup('http://www.boundaryvalueproblems.com/content/2013/1/77/mathml/M137','MathML',630,470);return false;" target="_blank" href="http://www.boundaryvalueproblems.com/content/2013/1/77/mathml/M137">View MathML</a>,<a onClick="popup('http://www.boundaryvalueproblems.com/content/2013/1/77/mathml/M153','MathML',630,470);return false;" target="_blank" href="http://www.boundaryvalueproblems.com/content/2013/1/77/mathml/M153">View MathML</a>,<a onClick="popup('http://www.boundaryvalueproblems.com/content/2013/1/77/mathml/M131','MathML',630,470);return false;" target="_blank" href="http://www.boundaryvalueproblems.com/content/2013/1/77/mathml/M131">View MathML</a>.

Shaw et al. Boundary Value Problems 2013 2013:77   doi:10.1186/1687-2770-2013-77
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