Measured transmission curves for the J-PLUS filter set after accounting for sky absorption, CCD quantum efficiency, and the total effect of the JAST/T80 telescope optical system. The four NB we exploit to look for bright Lyα emitters at z​ >  ​2 (namely, the J0395, J0410, J0430 and J0515 NBs) share their wavelength coverage with the g band and are shown here as filled-area curves.