Left: spot 1 marginal distributions of longitude (λ) and latitude (β) in degrees. Right: spot radius (γ) and period in days. All for BTr data. The vertical lines indicate the mean and the 90% credibility limits (shaded area). Because of the skewness of the distribution (curved line) the locus of maximum probability does not necessarily coincide with a parameter’s mean value and deviates from the global mode given in Table 3 for BTr.