Same as Fig. 2 but for a 1° × 1° grid of possible pole positions, covering just a fragment of the celestial sphere around the best solution, λ ∈ (30 °, 70°), β ∈ (−72°, −54°). Goodness-of-fit χ² values are colour coded, with darker colours marking the lower χ² values and anything above a 10% increase above the minimum χ² value is white. The yellow contour line indicates a 1% increase relative to the minimum χ² value obtained (marked with a “+”); the black contour line is a 10% increase.