Flux density versus line-of-sight velocity, V_los, as a function of time (FVt)-plot for R Crt. Each horizontal dotted line indicates an observation (spectra taken within 4 days from each other were averaged). Data are resampled to a resolution of 0.3 km s⁻¹ and only emission at levels ≥3σ is shown. The first spectrum in this plot was taken on 17/2/90; JD = 2447939.5, TJD = 7939. The last spectrum is from 20/3/2011. The vertical dashed line marks the stellar velocity V_* (Table 1). The flux density scale is shown by the bar on the right; the black and white horizontal lines mark the values of the drawn contours.