Compactness vs. surface area for three EOSs: SLy4 (solid red), Model1 (dashed green), and Model2 (dash-dotted blue), for two rotational frequencies: 0 Hz (thin lines) and 1200 Hz (thick lines). Lines of constant central density are indicated in grey (dark grey for SLy4, medium grey for Model2, and light grey for Model1). Corresponding values of the central density are given on the left side of the plot (in units of 10¹⁵g cm⁻³).