Detection plot of PSR B1237+25, the first candidate provided from the PRESTO analysis of a 30 min observation. The blind search was conducted over DMs between 1.0 and 60.0 with steps of 0.01 pc cm⁻³. Top-left panel: detection profile over two periods for the best DM and pulsar spin period, P0. Bottom-left panel: time vs. phase diagram for the best DM and P0. The right part of the bottom-left panel is the reduced χ² obtained from the stacked profile relative to the corresponding stacked median and variance at each time. Middle panel: spectrum vs. phase diagram for the best P0 and DM. Bottom-middle panel: reduced χ² obtained for each trial DM. Bottom-right panel: reduced χ² obtained for each trial (P0 and P0 time derivative, Ṗ) at the best DM. Top-right panels: reduced χ² relative to Ṗ for the best P0 and relative to P0 for the best Ṗ.