var vertex_size = 2; /* size of coordinate pairs, here: x, y => 2 */

/* array buffer of vertices (x,y) of pixel coordinates on 256px raster */
var vertex_array = [
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  137.53948974609375, 83.96038055419922, 
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  138,                83.96260070800781, 
  137.39028930664062, 83.71286010742188, 
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  137.23199462890625, 83.95570373535156, 
  137.216064453125,   83.9999771118164
];

/* array buffer of indices, two for each edge */
var index_array = [
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   2, 3,
   3, 4,
   4, 5,
   5, 6,
   6, 7,
   7, 8,
   8, 9,
   9,10,
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  84,85,
  85,86,
  86,87,
  87,88,
  88,89
];