the following general TNF W = ∑ i<j<k W ( i, j, k ) , (1) a generic term can be put in the following form: Each term corresponds to a different mechanism and has a different operatorial structure. The first three terms arise from the exchange of two pions between three nucleons. The a -term comes from πN S -wave scattering whereas the b -term and d -term, which are the most important, come from πN P -wave scattering. The specific form of these three terms in configuration space is the following: W (1 , 2 , 3) = aW$_{a}$ (1 , 2 , 3) + bW$_{b}$ (1 , 2 , 3) + dW$_{d}$ (1 , 2 , 3) + c$_{D}$W$_{D}$ (1 , 2 , 3) + c$_{E}$W$_{E}$ (1 , 2 , 3) . (2) W$_{a}$ (1 , 2 , 3) = W 0 ( $^{τ}$1 · $^{τ}$2 )( $^{σ}$1 · $^{r}$31 )( $^{σ}$2 · $^{r}$23 ) y ( r 31 ) y ( r 23 ) W$_{b}$ (1 , 2 , 3) = W 0 ( $^{τ}$1 · $^{τ}$2 )[( $^{σ}$1 · $^{σ}$2 ) y ( r 31 ) y ( r 23 ) + ( $^{σ}$1 · $^{r}$31 )( $^{σ}$2 · $^{r}$23 )( $^{r}$31 · $^{r}$23 ) t ( r 31 ) t ( r 23 ) + ( $^{σ}$1 · $^{r}$31 )( $^{σ}$2 · $^{r}$31 ) t ( r 31 ) y ( r 23 ) + ( $^{σ}$1 · $^{r}$23 )( $^{σ}$2 · $^{r}$23 ) y ( r 31 ) t ( r 23 )] W$_{d}$ (1 , 2 , 3) = W 0 ( $^{τ}$3 · $^{τ}$1 × $^{τ}$2 )[( $^{σ}$3 · $^{σ}$2 × $^{σ}$1 ) y ( r 31 ) y ( r 23 ) + ( $^{σ}$1 · $^{r}$31 )( $^{σ}$2 · $^{r}$23 )( $^{σ}$3 · $^{r}$31 × $^{r}$23 ) t ( r 31 ) t ( r 23 ) + ( $^{σ}$1 · $^{r}$31 )( $^{σ}$2 · $^{r}$31 × $^{σ}$3 ) t ( r 31 ) y ( r 23 ) + ( $^{σ}$2 · $^{r}$23 )( $^{σ}$3 · $^{r}$23 × $^{σ}$1 ) y ( r 31 ) t ( r 23 )] , (3) f 0 ( r ) = 12 π m 3 π 1 2 π 2 ∫ ∞ 0 dqq 2 j 0 ( qr ) q 2 + m 2 π F Λ ( q ) (4) y ( r ) = 1 r f ′ $_{0}$( r ) t ( r ) = 1 r y $^{′}$( r ) . (5) 5 The cutoff function F Λ in the TM’ or Brazil models is taken as F Λ = [(Λ 2 − m 2 $_{π}$) / (Λ $^{2}$+ q $^{2}$)]$^{2}$. In the N2LOL model it is taken as F Λ = exp( − q $^{4}$/ Λ $^{4}$). The momentum cutoff Λ is a where m$_{π}$ is the pion mass and with W 0 an overall strength. The b - and d -terms are present in the three models whereas the a -term is present in the TM’ and N2LOL and not in URIX. In the first two models, the radial functions y ( r ) and t ( r ) are obtained from the following function