function der_2_interpolate input Real curVal_i; input Real coeff1; input Real coeff2; input Real coeff3; input Real coeff4; input Real epsilon; input Real der_coeff1; input Real der_coeff2; input Real der_coeff3; input Real der_coeff4; input Real der_epsilon; input Real der_2_coeff1; input Real der_2_coeff2; input Real der_2_coeff3; input Real der_2_coeff4; input Real der_2_epsilon; output Real der_2_val; end der_2_interpolate;