private void ContentSettings_Changed(object sender, PropertyChangedEventArgs e) {
if (e.PropertyName != nameof(SettingsHolder.Content.SmoothCurves) || Model == null) return;
foreach (var series in Model.Series.OfType<LineSeries>()) {
series.Smooth = SettingsHolder.Content.SmoothCurves;
}
InvalidatePlot();
}