Logarithm of the velocity-integrated flux of water-masers in R Cas, which is derived from the area under Gaussian fits to maser main emission components versus time: ~24.5 kms⁻¹ (blue) and ~27.5 km s⁻¹ (red), respectively. Where the emission line in question has a signal-to-noise ratio lower than 3, the data point is marked with a black cross. When detected, both components demonstrate the same trend in their flux density with time. The vertical dotted lines indicate the star’s visual maxima (AAVSO data).