Bed Mesh

[percar]

I have a question when doing a bed mesh probe the height map file that is generated.
My bed has X0 Y0 at the front left hand side
I setup M557 X50:520 Y50:290 S20 and the file that is generated is as follows:
RepRapFirmware height map file v1 generated at 2016-11-27 07:50, mean error -0.20, deviation 0.14
xmin,xmax,ymin,ymax,radius,spacing,xnum,ynum
50.00,520.00,50.00,290.00,-1.00,20.00,24,13
-0.001, 0.148, 0.056, 0.072, 0.080, 0.119, 0.019, 0.098, 0.050, 0.034, 0.020, -0.034, -0.037, 0.033, 0.070, 0.020, 0.071, 0.103, 0.083, 0.097, 0.158, 0.079, -0.111, 0.161
-0.138, -0.074, -0.170, -0.162, -0.119, -0.136, -0.101, -0.099, -0.141, -0.144, -0.107, -0.109, -0.183, -0.162, -0.161, -0.151, -0.094, -0.034, -0.084, -0.021, -0.020, -0.002, 0.007, -0.063
-0.323, -0.334, -0.278, -0.213, -0.281, -0.256, -0.236, -0.204, -0.224, -0.272, -0.267, -0.320, -0.346, -0.187, -0.277, -0.296, -0.182, -0.226, -0.213, -0.199, -0.141, -0.202, -0.132, -0.178
-0.191, -0.099, -0.201, -0.127, -0.232, -0.191, -0.183, -0.183, -0.227, -0.218, -0.241, -0.180, -0.264, -0.221, -0.141, -0.086, -0.159, -0.128, -0.179, -0.119, -0.101, -0.108, 0.001, -0.032
-0.152, -0.195, -0.171, -0.158, -0.176, -0.121, -0.158, -0.202, -0.155, -0.273, -0.188, -0.160, -0.091, -0.126, -0.110, -0.060, -0.083, -0.118, -0.099, -0.025, -0.054, -0.032, 0.001, 0.059
-0.379, -0.332, -0.293, -0.381, -0.342, -0.348, -0.382, -0.364, -0.368, -0.362, -0.331, -0.292, -0.311, -0.327, -0.348, -0.309, -0.247, -0.200, -0.249, -0.204, -0.126, -0.155, -0.181, -0.110
-0.350, -0.321, -0.312, -0.286, -0.384, -0.214, -0.191, -0.322, -0.201, -0.273, -0.202, -0.158, -0.179, -0.242, -0.242, -0.179, -0.284, -0.179, -0.224, -0.168, -0.177, -0.139, -0.068, -0.119
-0.351, -0.281, -0.246, -0.213, -0.197, -0.251, -0.287, -0.267, -0.208, -0.180, -0.149, -0.169, -0.220, -0.208, -0.084, -0.079, -0.071, -0.110, -0.058, -0.079, -0.051, 0.017, 0.042, -0.011
-0.423, -0.452, -0.378, -0.421, -0.394, -0.426, -0.340, -0.361, -0.361, -0.315, -0.307, -0.291, -0.026, -0.281, -0.236, -0.236, -0.261, -0.281, -0.232, -0.250, -0.142, -0.163, -0.164, -0.199
-0.385, -0.341, -0.422, -0.334, -0.460, -0.427, -0.436, -0.411, -0.319, -0.341, -0.386, -0.280, -0.300, -0.282, -0.194, -0.258, -0.231, -0.201, -0.137, -0.181, -0.164, -0.177, -0.091, -0.093
-0.280, -0.351, -0.359, -0.381, -0.359, -0.401, -0.267, -0.318, -0.317, -0.272, -0.238, -0.259, -0.224, -0.319, -0.192, -0.076, -0.166, -0.129, -0.044, -0.039, 0.005, -0.024, -0.011, -0.103
-0.347, -0.322, -0.410, -0.445, -0.415, -0.404, -0.426, -0.360, -0.373, -0.284, -0.252, -0.208, -0.216, -0.212, -0.160, -0.208, -0.163, -0.106, -0.120, -0.072, -0.071, -0.080, -0.077, -0.029
-0.504, -0.579, -0.558, -0.611, -0.500, -0.562, -0.487, -0.504, -0.438, -0.364, -0.304, -0.380, -0.333, -0.303, -0.261, -0.292, -0.248, -0.199, -0.259, -0.227, -0.186, -0.203, -0.186, -0.186

is the file generated with the same path as the probe. For example line 1 begins at left front to right front, line 2 begins at right to left, line 3 begins at left to right
I know that the bed looks way out however if i measure this with an indicator i get nowhere near the errors that i am seeing on the map. I am using your differential probe to do the testing and it appears that there are some stray spikes in the file. I know that this may still be work in progress what i want to do is to correct the file for the errors that i can see and save that file as my base file.

[dc42]

The values in each row are always in order of increasing X, so not the same order as the points are probed. The rows are in order of increasing Y.