Table 1 Coefficient d_i and c_i.

d₁

\(\eta \sum\limits_{{l=1}}^{m} {{\xi _l}} {V^{\prime}_F}\left( {{h_c}} \right)+\left( {1 - \eta } \right){V^{\prime}_B}\left( {{h_c}} \right)\)

c₁

\(\mu \sum\limits_{{l=1}}^{m} {{\zeta _l}\left( {2l - 1} \right) - \left( {1 - \mu } \right)}\)

d₂

\(\eta \sum\limits_{{l=1}}^{m} {{\xi _l}} \left( {2l - 1} \right){V^{\prime}_F}\left( {{h_c}} \right) - \left( {1 - \eta } \right){V^{\prime}_B}\left( {{h_c}} \right)\)

c₂

\(\rho \sum\limits_{{l=1}}^{m} {{\varsigma _l}l - \left( {1 - \rho } \right)}\)

d₃

\(\eta \sum\limits_{{l=1}}^{m} {{\xi _l}} \left( {3{l^2} - 3l+1} \right){V^{\prime}_F}\left( {{h_c}} \right)+\left( {1 - \eta } \right){V^{\prime}_B}\left( {{h_c}} \right)\)

c₃

\(\mu \sum\limits_{{l=1}}^{m} {{\zeta _l}\left( {3{l^2} - 3l+1} \right)+\left( {1 - \mu } \right)}\)

d₄

\(\eta \sum\limits_{{l=1}}^{m} {{\xi _l}} {V^{\prime\prime\prime}_F}\left( {{h_c}} \right)+\left( {1 - \eta } \right){V^{\prime\prime\prime}_B}\left( {{h_c}} \right)\)

c₅

\(\rho \sum\limits_{{l=1}}^{m} {{\varsigma _l}{l^2}+\left( {1 - \rho } \right)}\)

d₅

\(\eta \sum\limits_{{l=1}}^{m} {{\xi _l}} \left( {4{l^3} - 6{l^2}+4l - 1} \right){V^{\prime}_F}\left( {{h_c}} \right) - \left( {1 - \eta } \right){V^{\prime}_B}\left( {{h_c}} \right)\)

d₆

\(\eta \sum\limits_{{l=1}}^{m} {{\xi _l}} \left( {2l - 1} \right){V^{\prime\prime\prime}_F}\left( {{h_c}} \right) - \left( {1 - \eta } \right){V^{\prime\prime\prime}_B}\left( {{h_c}} \right)\)