Currently, v2spa allows sparklines to compute their own y-axes without any input from the main chart. However, since sparklines don't display their own y-axes, there is no way for users to visually relate sparklines' magnitude to the main charts' magnitude. One way to help users relate magnitudes of sparklines with the main charts would be to scale their y-axes to the same range as the main chart, but centered to the sparkline's data, since they are often smaller than the main chart data.