Contour map of the parameters of interstellar bubbles on the plane (age, pressure). The red solid and long dashed lines on the left indicate SNRs. The blue short dashed lines indicate wind blown bubbles. The red long dashed line indicates the line of the shell formation in SNRs: the Sedov phase (adiabatic) lies on the left of this line. The thick lines indicate the interstellar hydrogen density contours in units of cm^-3. The thin lines indicate the SNR initial energy contours in units of 10⁵¹ erg, and the wind power contours in units of 10³⁷ erg/s. The line of circles indicate the observed pressure of the W 50 nebula.