Scaling of the flatness, F(Δt), for the intervals measured by PSP (left panels), Solar Orbiter (central panels) and Wind (right panels). The flatness was averaged over the three components of magnetic field (top panels) and velocity (bottom panels). Power-law fits F ∝ Δt^−κ are indicated (solid lines), together with the corresponding scaling exponent κ. The horizontal dashed gray line indicates the Gaussian reference value F = 3. When a break separates the two scaling ranges, vertical dashed lines indicate its time scale.