xychart
    title bla_x-axis bla
    %%        ~~~~~~ keyword...
    title "bla_x-axis bla"
    x-axis ds [jan0, d, _vertical-line, Bvertical]
    %%                   ~~~~~~~~ ~~~~ keyword
    x-axis ds ["_vertical-line","Bvertical-line"]
    y-axis x-axis_-20.22 --> 50
    %%           ^^ no sep between title and min 
    y-axis "x-axis_"-20.22 --> 50
    y-axis x-axis-20.22 --> 50
    %%     ^^^^^^ keyword...
    y-axis "x-axis" -20.22 --> 50
    bar [22, 23]