O–C diagrams for NSVS14256825 with previously published and our new data shown as yellow and green dots, respectively. Left: residuals O–C_lin,1 for a linear ephemeris fitted to the pre-2010 data, cycle numbers E < 9000 (dotted line). Right: residuals O–C_lin,2 for an elliptic orbit fit relative to the underlying linear ephemeris of the binary (Eq. (4)). Weighted mean data points for cyles E ≥ 0 are displayed (see text).