**Table 4:** Central wavelengths and dispersions of the Gauss filter simulating the transmissivity functions of *uvby* (Strömgren) photometric system. These values are taken from Cox (2000).
Colour	u	v	b	y
${\lambda_a}$ [Å]	3500	4100	4700	5500
${\sigma_a}$ [Å]	230	120	120	120

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