Unit of extrudedHeight for Entity

[mholt...@gmail.com]

I have defined two entities with an ellipse at the same point to represent a drilling place. 

One part (green) starts at the height of 53.16 m above ground and dips 50 m into the depth up 3.16 m. At this point (yellow) the second part of this drilling starts and dips 136,68 m into the depth up to -139.84 m.

I think each ellipse is placed at their correct height. But if i want to fill the space between part 1 and part 2 with the color of part 1 (green), which value needs to be set for extrudedHeight? 

let drilling_1_2 = viewer.entities.add({

id: '125',

name: 'Bohrung_1_0',

position: Cartesian3.fromDegrees(13.2252164300779, 52.5031361781643),

ellipse: {

semiMinorAxis: 10,

semiMajorAxis: 10,

material: Color.YELLOW,

height: 3.16,

// extrudedHeight: 136.68

}

});

let drilling_1_3 = viewer.entities.add({

id: '126',

name: 'Bohrung_1_0',

position: Cartesian3.fromDegrees(13.2252164300779, 52.5031361781643),

ellipse: {

semiMinorAxis: 10,

semiMajorAxis: 10,

material: Color.GREEN,

height: 53.16,

extrudedHeight: -50

}

});

I thought -50, but this value simply covers the start of part 2 (yellow). How do i specify the correct extrudedHeight to get this entity going 50 meters deep from 53.16 m to 3.16 m above the ground?