  Nearby detached double-lined eclipsing binaries with most accurate data were
studied and 290 systems were found with at least one main-sequence component
having a metallicity $0.008\leq Z\leq 0.040$. Stellar parameters, light ratios,
Gaia DR2 trigonometric parallaxes, extinctions and/or reddening were
investigated and only 206 systems were selected eligible to calculate empirical
bolometric corrections. NASA-IPAC Galactic dust maps were main source of
extinctions. Unreliable extinctions at low Galactic latitudes $|b|\leq5^o$ were
replaced with individual determinations, if they exist in the literature, else
associated systems are discarded. Main-sequence stars of remaining systems were
used to calculate bolometric corrections ($BC$) and to calibrate $BC-T_{eff}$
relation, which is valid in the range 3100-36000 K. De-reddened $(B-V)_0$
colours, on the other hand, allowed us to calibrate two intrinsic colour
effective temperature relations, where the linear one is valid for
$T_{eff}>10000$ K, while the quadratic relation is valid for $T_{eff}<10000$ K,
that is, both are valid in the same temperature range $BC-T_{eff}$ relation is
valid. New $BC$ computed from $T_{eff}$ and other astrophysical parameters are
tabulated, as well.
