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tokens: 1 . While ID11 and notably also A4.1 fall in the transition region between HII galaxies and giant HII regions, the rest of the lensed systems are among the most luminous star-forming systems and occupy a region of the diagram corresponding to the most luminous HII galaxies. The Lynx arc result from Fosbury et al. (2003) is shown with two different values of velocity dispersion; the lower value corresponds to the semi-forbidden lines and the higher value corresponds to the fit to the permitted CIV 1550 Å line. There is more scatter in the lensed systems, but on the whole the results tend to support the lensing model estimates of the magnification apart from the Lynx arc result when using semi-forbidden lines. There is a crucial general point that we need to make regarding this exercise: The luminosity in these young bursts of star formation evolves quickly in timescales of few megayears, which moves their position away from the correlation to lower luminosities and smaller equivalent widths (EW) of H or H ( Melnick et al. 2000 ; Bordalo Telles 2011 ). This fact may be related to the scatter of the Richard et al. (2011) points below the relation (Fig. 1 ). It is therefore highly recommended to obtain and publish the EW of H or H of star-forming systems to allow for an evolution correction to be performed. 4. Conclusions Regarding the intrinsic properties of ID11, Fig. 1 implies that it is either a luminous giant HII region, such as 30 Doradus in the Large Magellanic Cloud or those found in spiral galaxies like M101, or a low luminosity HII galaxy. Given that the deep HST images of ID11 show no indication of an underlying galaxy, we confirm the Vanzella et al. (2016) conclusion that ID11 is a low luminosity HII galaxy at . The relation spans more than three orders of magnitude in luminosity, which allows us to observe a significant number of objects at large redshifts without recourse to gravitational telescopes; hence this accounts for the power of the relation as a cosmological probe ( Plionis et al. 2011 ; Terlevich et al. 2015 ; Chávez et al. 2016 ). But, of course, only the most luminous HII galaxies can be observed at higher redshifts with the current generation of 810 m telescopes, so gravitationally amplified objects such as ID11 provide us with the unique chance to verify that at high redshift the correlation holds also for low luminosity and possibly low metallicity HII galaxies. We used an independent method, which is based on the standard candle provided by the relation that is valid for HII galaxies and giant HII regions, to measure the amplification affecting the star-forming system ID11 by the Abell cluster S0163 as ; this coincides with the value of 17 obtained by Vanzella et al. (2016) from the strong lensing model of Caminha et al. (2015) . Our result suggests that we can use giant HII regions in high- lensed galaxies as instruments for studying gravitational lenses and that the combination of the standard candle plus detailed