
Figure 4
Comparison between the MarchDollase function (black lines) and its Legendre polynomial expansion truncated at the sixth order (dotdashed red line) versus for different values of r ranging from 0.7 to 1.5. For all r values, these truncated Legendre polynomial expansions fit the MarchDollase function quite well. To assess this point, the inset displays the relative error between and its truncated expansion for different r values. The maximal error is lower than 8% for this range of r values. 