Hello,
In the rectangular, the first line (15) is the first quartile (the cumulative density function has value 0.25). The medium line (25) is the median (the cdf has value 0.5). The last line (32) is the third quartile (the cdf has value 0.75)
This already gives you an idea of the shape of the cdf !
The extremeties of the moustaches (horizontal lines) correspond to the extremal values