\begin{table}%ta1 \caption{\label{2MASSTCS}Characteristic parameters of the 2MASS and TCS photometric systems.} \small%\centering \par \begin{tabular}{lcccccc} \hline\hline\noalign{\smallskip} & 2MASS & TCS & $\Delta(\%)$ \\ \hline $\lambda_{{\rm eff}}$ & $12~285$ & $12~790$ & \\ ${\rm m}_{J}$ & $-0.001$ & $-0.013$ & \\ $\mathcal{F}_{J}$ & $3.079$ & $2.912$ & \\ $\mathcal{F}_{{\rm eff}}$ & $3.076$ & $3.303$ & $-6.9\%$ \\ %\hline $\lambda_{{\rm eff}}$ & $16~385$ & $16~483$ & \\ ${\rm m}_{H}$ & $+0.019$ & $-0.005$ & \\ $\mathcal{F}_{H}$ & $1.150$ & $1.192$ & \\ $\mathcal{F}_{{\rm eff}}$ & $1.170$ & $1.211$ & $-3.4\%$ \\ %\hline $\lambda_{{\rm eff}}$ & $21~521$ & $21~869$ & \\ ${m}_{K}$ & $-0.017$ & $-0.029$ & \\ $\mathcal{F}_{K}$ & $0.430$ & $0.426$ & \\ $\mathcal{F}_{{\rm eff}}$ & $0.423$ & $0.439$ & $-3.6\%$ \\ \hline \end{tabular} \tablefoot{Wavelengths are in \AA\ and the Vega's monochromatic absolute fluxes in ${10^{-10}~\rm erg~cm^{-2}~s^{-1}}~\AA^{-1}$. 2MASS effective wavelengths ($\lambda_{{\rm eff}}$), magnitudes and fluxes are from \citet{casagrande06}, where the latter has been modified by $-1.6, +1.5$ and $+0.3$ percent in $J,H$ and $K_{\rm S}$ band respectively as described in Sect.~\ref{tuning}. The TCS values are from \citet{alonso94:photometry}. For the TCS system $\mathcal{F}_{{\rm eff}}$ has been computed by shifting the value at the 2MASS effective wavelength (Fig.~\ref{f:absflx}). $\Delta(\%)$ is the percent decrease of the TCS $\mathcal{F}_{{\rm eff}}$ needed to match the 2MASS values.} \end{table}