What is first bytes for first three commands

Nobody has claimed this yet.

I don't know TypeScript but I very need to develop print Image on StarTUP 900 printer.
I use .net/C# lang.
There is function from this project:
```
raster(image: Image, mode: RasterMode = 'NORMAL') {
if (!(image instanceof Image))
throw new TypeError('Only escpos.Image supported');
mode = utils.upperCase(mode);
if (mode === 'DHDW' ||
mode === 'DWH' ||
mode === 'DHW') mode = 'DWDH';
const raster = image.toRaster();
const header = _.GSV0_FORMAT[`GSV0_${mode}` as const];
this.buffer.write(header);
this.buffer.writeUInt16LE(raster.width);
this.buffer.writeUInt16LE(raster.height);
this.buffer.write(raster.data);
return this;
};
```
So, can anybody send me bytes for these three commands:
```
this.buffer.write(header);
this.buffer.writeUInt16LE(raster.width);
this.buffer.writeUInt16LE(raster.height);
```
???
In the case when Image has size 384x384 pixels

Start with the raster() entry point and the GSV0_FORMAT lookup shown in the issue. Trace how header, raster.width, and raster.height are encoded, then verify the resulting bytes for a 384x384 image against the printer protocol or existing tests. Done means documenting the three byte sequences clearly for the StarTUP 900 use case.

Written by the indexing model from the issue text.