The measured distance value is usually too large. To get a more accurate result, a bias needs to be applied. Strictly speaking, the value of this bias depends on the received signal strength. For the DWM1001, it should be accurate enough to apply the bias for the measured range. This is described in Application Note APS011.
The bias correction is implemented in Decawave's driver code. The code for that is available, but there's no license that would allow us to use that code. The following description is intended to serve as a specification, to make it possible to create a clean-room implementation.
The range bias value is applied using the following formular:
<corrected distance> = <measured distance> + <range bias>
The range bias value consists of two parts according to the following formular:
<range bias> = <base part> + <distance-dependent part>
The range bias value depends on the following parameters:
- The measured distance
- The channel being used to send/receive the ranging messages
- The PRF setting (16 MHz or 64 MHz)
Channels are grouped into two groups:
- 1, 2, 3, and 5 are narrow-band channels.
- 4 and 7 are wide-band channels.
The base part values are:
-23 cm
for 16 MHz PRF, narrow-band channel
-28 cm
for 16 MHz PRF, wide-band channel
-17 cm
for 64 MHz PRF, narrow-band channel
-30 cm
for 64 MHz PRF, wide-band channel
The following lists provide the distance-dependent part. There is one list for each combination of channel and PRF setting. Each list item provides the distance-dependent part of the range bias for an interval of measure distances.
Since all of this would be extremely tedious to write manually, I've also prepared a TOML file to aid code generation: range-tables.zip
Distance-dependent part values for channel 1, 16 MHz PRF:
0 cm
for 0 cm <= d <= 25 cm
1 cm
for 25 cm < d <= 75 cm
2 cm
for 75 cm < d <= 100 cm
3 cm
for 100 cm < d <= 125 cm
4 cm
for 125 cm < d <= 175 cm
5 cm
for 175 cm < d <= 225 cm
6 cm
for 225 cm < d <= 275 cm
7 cm
for 275 cm < d <= 300 cm
8 cm
for 300 cm < d <= 325 cm
9 cm
for 325 cm < d <= 375 cm
10 cm
for 375 cm < d <= 450 cm
11 cm
for 450 cm < d <= 500 cm
12 cm
for 500 cm < d <= 575 cm
13 cm
for 575 cm < d <= 625 cm
14 cm
for 625 cm < d <= 700 cm
15 cm
for 700 cm < d <= 750 cm
16 cm
for 750 cm < d <= 825 cm
17 cm
for 825 cm < d <= 900 cm
18 cm
for 900 cm < d <= 1000 cm
19 cm
for 1000 cm < d <= 1075 cm
20 cm
for 1075 cm < d <= 1175 cm
21 cm
for 1175 cm < d <= 1250 cm
22 cm
for 1250 cm < d <= 1350 cm
23 cm
for 1350 cm < d <= 1450 cm
24 cm
for 1450 cm < d <= 1575 cm
25 cm
for 1575 cm < d <= 1650 cm
26 cm
for 1650 cm < d <= 1775 cm
27 cm
for 1775 cm < d <= 1900 cm
28 cm
for 1900 cm < d <= 2050 cm
29 cm
for 2050 cm < d <= 2225 cm
30 cm
for 2225 cm < d <= 2450 cm
31 cm
for 2450 cm < d <= 2725 cm
32 cm
for 2725 cm < d <= 3175 cm
33 cm
for 3175 cm < d <= 3875 cm
34 cm
for 3875 cm < d <= 5550 cm
35 cm
for d > 5550 cm
Distance-dependent part values for channel 2, 16 MHz PRF:
0 cm
for 0 cm <= d <= 25 cm
1 cm
for 25 cm < d <= 50 cm
2 cm
for 50 cm < d <= 100 cm
3 cm
for 100 cm < d <= 125 cm
4 cm
for 125 cm < d <= 150 cm
5 cm
for 150 cm < d <= 200 cm
6 cm
for 200 cm < d <= 225 cm
7 cm
for 225 cm < d <= 250 cm
8 cm
for 250 cm < d <= 300 cm
9 cm
for 300 cm < d <= 325 cm
10 cm
for 325 cm < d <= 375 cm
11 cm
for 375 cm < d <= 450 cm
12 cm
for 450 cm < d <= 500 cm
13 cm
for 500 cm < d <= 550 cm
14 cm
for 550 cm < d <= 600 cm
15 cm
for 600 cm < d <= 675 cm
16 cm
for 675 cm < d <= 725 cm
17 cm
for 725 cm < d <= 800 cm
18 cm
for 800 cm < d <= 875 cm
19 cm
for 875 cm < d <= 950 cm
20 cm
for 950 cm < d <= 1025 cm
21 cm
for 1025 cm < d <= 1100 cm
22 cm
for 1100 cm < d <= 1175 cm
23 cm
for 1175 cm < d <= 1275 cm
24 cm
for 1275 cm < d <= 1375 cm
25 cm
for 1375 cm < d <= 1450 cm
26 cm
for 1450 cm < d <= 1550 cm
27 cm
for 1550 cm < d <= 1650 cm
28 cm
for 1650 cm < d <= 1775 cm
29 cm
for 1775 cm < d <= 1950 cm
30 cm
for 1950 cm < d <= 2125 cm
31 cm
for 2125 cm < d <= 2400 cm
32 cm
for 2400 cm < d <= 2775 cm
33 cm
for 2775 cm < d <= 3375 cm
34 cm
for 3375 cm < d <= 4850 cm
35 cm
for 4850 cm < d <= 6000 cm
36 cm
for d > 6000 cm
Distance-dependent part values for channel 3, 16 MHz PRF:
0 cm
for 0 cm <= d <= 25 cm
1 cm
for 25 cm < d <= 50 cm
2 cm
for 50 cm < d <= 75 cm
3 cm
for 75 cm < d <= 100 cm
4 cm
for 100 cm < d <= 125 cm
5 cm
for 125 cm < d <= 175 cm
6 cm
for 175 cm < d <= 200 cm
7 cm
for 200 cm < d <= 225 cm
8 cm
for 225 cm < d <= 250 cm
9 cm
for 250 cm < d <= 300 cm
10 cm
for 300 cm < d <= 350 cm
11 cm
for 350 cm < d <= 400 cm
12 cm
for 400 cm < d <= 450 cm
13 cm
for 450 cm < d <= 500 cm
14 cm
for 500 cm < d <= 550 cm
15 cm
for 550 cm < d <= 600 cm
16 cm
for 600 cm < d <= 650 cm
17 cm
for 650 cm < d <= 700 cm
18 cm
for 700 cm < d <= 775 cm
19 cm
for 775 cm < d <= 825 cm
20 cm
for 825 cm < d <= 900 cm
21 cm
for 900 cm < d <= 975 cm
22 cm
for 975 cm < d <= 1050 cm
23 cm
for 1050 cm < d <= 1125 cm
24 cm
for 1125 cm < d <= 1225 cm
25 cm
for 1225 cm < d <= 1300 cm
26 cm
for 1300 cm < d <= 1375 cm
27 cm
for 1375 cm < d <= 1475 cm
28 cm
for 1475 cm < d <= 1575 cm
29 cm
for 1575 cm < d <= 1725 cm
30 cm
for 1725 cm < d <= 1900 cm
31 cm
for 1900 cm < d <= 2125 cm
32 cm
for 2125 cm < d <= 2450 cm
33 cm
for 2450 cm < d <= 3000 cm
34 cm
for 3000 cm < d <= 4325 cm
35 cm
for 4325 cm < d <= 5325 cm
36 cm
for d > 5325 cm
Distance-dependent part values for channel 4, 16 MHz PRF:
0 cm
for 0 cm <= d <= 175 cm
2 cm
for 175 cm < d <= 200 cm
3 cm
for 200 cm < d <= 225 cm
5 cm
for 225 cm < d <= 250 cm
6 cm
for 250 cm < d <= 275 cm
8 cm
for 275 cm < d <= 300 cm
9 cm
for 300 cm < d <= 325 cm
10 cm
for 325 cm < d <= 350 cm
11 cm
for 350 cm < d <= 375 cm
12 cm
for 375 cm < d <= 400 cm
13 cm
for 400 cm < d <= 425 cm
14 cm
for 425 cm < d <= 450 cm
15 cm
for 450 cm < d <= 475 cm
16 cm
for 475 cm < d <= 500 cm
17 cm
for 500 cm < d <= 525 cm
18 cm
for 525 cm < d <= 550 cm
19 cm
for 550 cm < d <= 575 cm
20 cm
for 575 cm < d <= 600 cm
21 cm
for 600 cm < d <= 650 cm
22 cm
for 650 cm < d <= 675 cm
23 cm
for 675 cm < d <= 700 cm
24 cm
for 700 cm < d <= 750 cm
25 cm
for 750 cm < d <= 775 cm
26 cm
for 775 cm < d <= 800 cm
27 cm
for 800 cm < d <= 850 cm
28 cm
for 850 cm < d <= 900 cm
29 cm
for 900 cm < d <= 950 cm
30 cm
for 950 cm < d <= 1000 cm
31 cm
for 1000 cm < d <= 1050 cm
32 cm
for 1050 cm < d <= 1100 cm
33 cm
for 1100 cm < d <= 1150 cm
34 cm
for 1150 cm < d <= 1200 cm
35 cm
for 1200 cm < d <= 1250 cm
36 cm
for 1250 cm < d <= 1300 cm
37 cm
for 1300 cm < d <= 1375 cm
38 cm
for 1375 cm < d <= 1425 cm
39 cm
for 1425 cm < d <= 1475 cm
40 cm
for 1475 cm < d <= 1525 cm
41 cm
for 1525 cm < d <= 1575 cm
42 cm
for 1575 cm < d <= 1650 cm
43 cm
for 1650 cm < d <= 1700 cm
44 cm
for 1700 cm < d <= 1775 cm
45 cm
for 1775 cm < d <= 1850 cm
46 cm
for 1850 cm < d <= 1950 cm
47 cm
for 1950 cm < d <= 2025 cm
48 cm
for 2025 cm < d <= 2125 cm
49 cm
for 2125 cm < d <= 2225 cm
50 cm
for 2225 cm < d <= 2350 cm
51 cm
for 2350 cm < d <= 2475 cm
52 cm
for 2475 cm < d <= 2600 cm
53 cm
for 2600 cm < d <= 2750 cm
54 cm
for 2750 cm < d <= 2900 cm
55 cm
for 2900 cm < d <= 3075 cm
56 cm
for 3075 cm < d <= 3250 cm
57 cm
for 3250 cm < d <= 3475 cm
58 cm
for 3475 cm < d <= 3750 cm
59 cm
for 3750 cm < d <= 4100 cm
60 cm
for 4100 cm < d <= 4550 cm
61 cm
for 4550 cm < d <= 5175 cm
62 cm
for 5175 cm < d <= 5950 cm
63 cm
for d > 5950 cm
Distance-dependent part values for channel 5, 16 MHz PRF:
0 cm
for 0 cm <= d <= 25 cm
2 cm
for 25 cm < d <= 50 cm
3 cm
for 50 cm < d <= 75 cm
4 cm
for 75 cm < d <= 100 cm
5 cm
for 100 cm < d <= 125 cm
6 cm
for 125 cm < d <= 150 cm
8 cm
for 150 cm < d <= 175 cm
9 cm
for 175 cm < d <= 200 cm
10 cm
for 200 cm < d <= 225 cm
11 cm
for 225 cm < d <= 275 cm
12 cm
for 275 cm < d <= 300 cm
13 cm
for 300 cm < d <= 350 cm
14 cm
for 350 cm < d <= 375 cm
15 cm
for 375 cm < d <= 400 cm
16 cm
for 400 cm < d <= 450 cm
17 cm
for 450 cm < d <= 500 cm
18 cm
for 500 cm < d <= 525 cm
19 cm
for 525 cm < d <= 575 cm
20 cm
for 575 cm < d <= 625 cm
21 cm
for 625 cm < d <= 675 cm
22 cm
for 675 cm < d <= 725 cm
23 cm
for 725 cm < d <= 775 cm
24 cm
for 775 cm < d <= 850 cm
25 cm
for 850 cm < d <= 900 cm
26 cm
for 900 cm < d <= 950 cm
27 cm
for 950 cm < d <= 1025 cm
28 cm
for 1025 cm < d <= 1100 cm
29 cm
for 1100 cm < d <= 1200 cm
30 cm
for 1200 cm < d <= 1325 cm
31 cm
for 1325 cm < d <= 1475 cm
32 cm
for 1475 cm < d <= 1700 cm
33 cm
for 1700 cm < d <= 2075 cm
34 cm
for 2075 cm < d <= 3000 cm
35 cm
for 3000 cm < d <= 3700 cm
36 cm
for d > 3700 cm
Distance-dependent part values for channel 7, 16 MHz PRF:
0 cm
for 0 cm <= d <= 100 cm
1 cm
for 100 cm < d <= 125 cm
4 cm
for 125 cm < d <= 150 cm
6 cm
for 150 cm < d <= 175 cm
9 cm
for 175 cm < d <= 200 cm
10 cm
for 200 cm < d <= 225 cm
12 cm
for 225 cm < d <= 250 cm
14 cm
for 250 cm < d <= 275 cm
16 cm
for 275 cm < d <= 300 cm
17 cm
for 300 cm < d <= 325 cm
19 cm
for 325 cm < d <= 350 cm
20 cm
for 350 cm < d <= 375 cm
21 cm
for 375 cm < d <= 400 cm
22 cm
for 400 cm < d <= 425 cm
24 cm
for 425 cm < d <= 450 cm
25 cm
for 450 cm < d <= 475 cm
26 cm
for 475 cm < d <= 500 cm
27 cm
for 500 cm < d <= 525 cm
28 cm
for 525 cm < d <= 550 cm
29 cm
for 550 cm < d <= 575 cm
30 cm
for 575 cm < d <= 625 cm
31 cm
for 625 cm < d <= 650 cm
32 cm
for 650 cm < d <= 675 cm
33 cm
for 675 cm < d <= 725 cm
34 cm
for 725 cm < d <= 750 cm
35 cm
for 750 cm < d <= 775 cm
36 cm
for 775 cm < d <= 800 cm
37 cm
for 800 cm < d <= 850 cm
38 cm
for 850 cm < d <= 875 cm
39 cm
for 875 cm < d <= 900 cm
40 cm
for 900 cm < d <= 950 cm
41 cm
for 950 cm < d <= 975 cm
42 cm
for 975 cm < d <= 1000 cm
43 cm
for 1000 cm < d <= 1050 cm
44 cm
for 1050 cm < d <= 1100 cm
45 cm
for 1100 cm < d <= 1150 cm
46 cm
for 1150 cm < d <= 1200 cm
47 cm
for 1200 cm < d <= 1250 cm
48 cm
for 1250 cm < d <= 1300 cm
49 cm
for 1300 cm < d <= 1375 cm
50 cm
for 1375 cm < d <= 1450 cm
51 cm
for 1450 cm < d <= 1525 cm
52 cm
for 1525 cm < d <= 1600 cm
53 cm
for 1600 cm < d <= 1700 cm
54 cm
for 1700 cm < d <= 1800 cm
55 cm
for 1800 cm < d <= 1875 cm
56 cm
for 1875 cm < d <= 2000 cm
57 cm
for 2000 cm < d <= 2125 cm
58 cm
for 2125 cm < d <= 2300 cm
59 cm
for 2300 cm < d <= 2525 cm
60 cm
for 2525 cm < d <= 2800 cm
61 cm
for 2800 cm < d <= 3175 cm
62 cm
for 3175 cm < d <= 3675 cm
63 cm
for 3675 cm < d <= 4200 cm
64 cm
for 4200 cm < d <= 4550 cm
65 cm
for 4550 cm < d <= 4850 cm
66 cm
for 4850 cm < d <= 5125 cm
67 cm
for d > 5125 cm
Distance-dependent part values for channel 1, 64 MHz PRF:
0 cm
for 0 cm <= d <= 25 cm
1 cm
for 25 cm < d <= 50 cm
3 cm
for 50 cm < d <= 75 cm
4 cm
for 75 cm < d <= 100 cm
5 cm
for 100 cm < d <= 125 cm
6 cm
for 125 cm < d <= 175 cm
7 cm
for 175 cm < d <= 250 cm
8 cm
for 250 cm < d <= 325 cm
9 cm
for 325 cm < d <= 400 cm
10 cm
for 400 cm < d <= 475 cm
11 cm
for 475 cm < d <= 550 cm
12 cm
for 550 cm < d <= 600 cm
13 cm
for 600 cm < d <= 675 cm
14 cm
for 675 cm < d <= 750 cm
15 cm
for 750 cm < d <= 800 cm
16 cm
for 800 cm < d <= 875 cm
17 cm
for 875 cm < d <= 950 cm
18 cm
for 950 cm < d <= 1075 cm
19 cm
for 1075 cm < d <= 1200 cm
20 cm
for 1200 cm < d <= 1400 cm
21 cm
for 1400 cm < d <= 1950 cm
22 cm
for 1950 cm < d <= 2525 cm
23 cm
for 2525 cm < d <= 3000 cm
24 cm
for 3000 cm < d <= 3925 cm
25 cm
for d > 3925 cm
Distance-dependent part values for channel 2, 64 MHz PRF:
0 cm
for 0 cm <= d <= 25 cm
1 cm
for 25 cm < d <= 50 cm
3 cm
for 50 cm < d <= 75 cm
4 cm
for 75 cm < d <= 100 cm
6 cm
for 100 cm < d <= 150 cm
7 cm
for 150 cm < d <= 225 cm
8 cm
for 225 cm < d <= 300 cm
9 cm
for 300 cm < d <= 350 cm
10 cm
for 350 cm < d <= 425 cm
11 cm
for 425 cm < d <= 475 cm
12 cm
for 475 cm < d <= 525 cm
13 cm
for 525 cm < d <= 600 cm
14 cm
for 600 cm < d <= 650 cm
15 cm
for 650 cm < d <= 700 cm
16 cm
for 700 cm < d <= 775 cm
17 cm
for 775 cm < d <= 825 cm
18 cm
for 825 cm < d <= 925 cm
19 cm
for 925 cm < d <= 1050 cm
20 cm
for 1050 cm < d <= 1225 cm
21 cm
for 1225 cm < d <= 1700 cm
22 cm
for 1700 cm < d <= 2225 cm
23 cm
for 2225 cm < d <= 2625 cm
24 cm
for 2625 cm < d <= 3450 cm
25 cm
for d > 3450 cm
Distance-dependent part values for channel 3, 64 MHz PRF:
0 cm
for 0 cm <= d <= 25 cm
2 cm
for 25 cm < d <= 50 cm
3 cm
for 50 cm < d <= 75 cm
5 cm
for 75 cm < d <= 100 cm
6 cm
for 100 cm < d <= 125 cm
7 cm
for 125 cm < d <= 200 cm
8 cm
for 200 cm < d <= 250 cm
9 cm
for 250 cm < d <= 325 cm
10 cm
for 325 cm < d <= 375 cm
11 cm
for 375 cm < d <= 425 cm
12 cm
for 425 cm < d <= 475 cm
13 cm
for 475 cm < d <= 525 cm
14 cm
for 525 cm < d <= 575 cm
15 cm
for 575 cm < d <= 625 cm
16 cm
for 625 cm < d <= 675 cm
17 cm
for 675 cm < d <= 750 cm
18 cm
for 750 cm < d <= 825 cm
19 cm
for 825 cm < d <= 925 cm
20 cm
for 925 cm < d <= 1100 cm
21 cm
for 1100 cm < d <= 1500 cm
22 cm
for 1500 cm < d <= 1975 cm
23 cm
for 1975 cm < d <= 2325 cm
24 cm
for 2325 cm < d <= 3050 cm
25 cm
for d > 3050 cm
Distance-dependent part values for channel 4, 64 MHz PRF:
0 cm
for 0 cm <= d <= 175 cm
1 cm
for 175 cm < d <= 200 cm
3 cm
for 200 cm < d <= 225 cm
5 cm
for 225 cm < d <= 250 cm
6 cm
for 250 cm < d <= 275 cm
7 cm
for 275 cm < d <= 300 cm
8 cm
for 300 cm < d <= 325 cm
10 cm
for 325 cm < d <= 350 cm
11 cm
for 350 cm < d <= 375 cm
12 cm
for 375 cm < d <= 400 cm
14 cm
for 400 cm < d <= 425 cm
15 cm
for 425 cm < d <= 450 cm
16 cm
for 450 cm < d <= 475 cm
18 cm
for 475 cm < d <= 500 cm
19 cm
for 500 cm < d <= 525 cm
20 cm
for 525 cm < d <= 550 cm
21 cm
for 550 cm < d <= 600 cm
22 cm
for 600 cm < d <= 625 cm
23 cm
for 625 cm < d <= 675 cm
24 cm
for 675 cm < d <= 700 cm
25 cm
for 700 cm < d <= 725 cm
26 cm
for 725 cm < d <= 750 cm
27 cm
for 750 cm < d <= 800 cm
28 cm
for 800 cm < d <= 825 cm
29 cm
for 825 cm < d <= 850 cm
30 cm
for 850 cm < d <= 875 cm
31 cm
for 875 cm < d <= 925 cm
32 cm
for 925 cm < d <= 975 cm
33 cm
for 975 cm < d <= 1025 cm
34 cm
for 1025 cm < d <= 1075 cm
35 cm
for 1075 cm < d <= 1125 cm
36 cm
for 1125 cm < d <= 1200 cm
37 cm
for 1200 cm < d <= 1250 cm
38 cm
for 1250 cm < d <= 1325 cm
39 cm
for 1325 cm < d <= 1400 cm
40 cm
for 1400 cm < d <= 1500 cm
41 cm
for 1500 cm < d <= 1600 cm
42 cm
for 1600 cm < d <= 1700 cm
43 cm
for 1700 cm < d <= 1850 cm
44 cm
for 1850 cm < d <= 2025 cm
45 cm
for 2025 cm < d <= 2225 cm
46 cm
for 2225 cm < d <= 2450 cm
47 cm
for 2450 cm < d <= 2725 cm
48 cm
for 2725 cm < d <= 3050 cm
49 cm
for 3050 cm < d <= 3400 cm
50 cm
for 3400 cm < d <= 3650 cm
51 cm
for 3650 cm < d <= 3850 cm
52 cm
for 3850 cm < d <= 4050 cm
53 cm
for 4050 cm < d <= 4450 cm
54 cm
for 4450 cm < d <= 5500 cm
55 cm
for 5500 cm < d <= 6225 cm
56 cm
for d > 6225 cm
Distance-dependent part values for channel 5, 64 MHz PRF:
0 cm
for 0 cm <= d <= 25 cm
3 cm
for 25 cm < d <= 50 cm
5 cm
for 50 cm < d <= 75 cm
6 cm
for 75 cm < d <= 100 cm
7 cm
for 100 cm < d <= 150 cm
8 cm
for 150 cm < d <= 175 cm
9 cm
for 175 cm < d <= 225 cm
10 cm
for 225 cm < d <= 250 cm
11 cm
for 250 cm < d <= 300 cm
12 cm
for 300 cm < d <= 325 cm
13 cm
for 325 cm < d <= 375 cm
14 cm
for 375 cm < d <= 400 cm
15 cm
for 400 cm < d <= 425 cm
16 cm
for 425 cm < d <= 475 cm
17 cm
for 475 cm < d <= 525 cm
18 cm
for 525 cm < d <= 575 cm
19 cm
for 575 cm < d <= 650 cm
20 cm
for 650 cm < d <= 750 cm
21 cm
for 750 cm < d <= 1050 cm
22 cm
for 1050 cm < d <= 1375 cm
23 cm
for 1375 cm < d <= 1625 cm
24 cm
for 1625 cm < d <= 2125 cm
25 cm
for d > 2125 cm
Distance-dependent part values for channel 7, 64 MHz PRF:
0 cm
for 0 cm <= d <= 100 cm
1 cm
for 100 cm < d <= 125 cm
4 cm
for 125 cm < d <= 150 cm
6 cm
for 150 cm < d <= 175 cm
8 cm
for 175 cm < d <= 200 cm
10 cm
for 200 cm < d <= 225 cm
12 cm
for 225 cm < d <= 250 cm
15 cm
for 250 cm < d <= 275 cm
17 cm
for 275 cm < d <= 300 cm
18 cm
for 300 cm < d <= 325 cm
20 cm
for 325 cm < d <= 350 cm
21 cm
for 350 cm < d <= 375 cm
22 cm
for 375 cm < d <= 400 cm
24 cm
for 400 cm < d <= 425 cm
25 cm
for 425 cm < d <= 450 cm
26 cm
for 450 cm < d <= 475 cm
28 cm
for 475 cm < d <= 500 cm
29 cm
for 500 cm < d <= 525 cm
30 cm
for 525 cm < d <= 550 cm
31 cm
for 550 cm < d <= 575 cm
32 cm
for 575 cm < d <= 600 cm
33 cm
for 600 cm < d <= 625 cm
34 cm
for 625 cm < d <= 650 cm
35 cm
for 650 cm < d <= 700 cm
36 cm
for 700 cm < d <= 725 cm
37 cm
for 725 cm < d <= 775 cm
38 cm
for 775 cm < d <= 825 cm
39 cm
for 825 cm < d <= 875 cm
40 cm
for 875 cm < d <= 925 cm
41 cm
for 925 cm < d <= 975 cm
42 cm
for 975 cm < d <= 1050 cm
43 cm
for 1050 cm < d <= 1150 cm
44 cm
for 1150 cm < d <= 1250 cm
45 cm
for 1250 cm < d <= 1350 cm
46 cm
for 1350 cm < d <= 1500 cm
47 cm
for 1500 cm < d <= 1675 cm
48 cm
for 1675 cm < d <= 1875 cm
49 cm
for 1875 cm < d <= 2075 cm
50 cm
for 2075 cm < d <= 2250 cm
51 cm
for 2250 cm < d <= 2375 cm
52 cm
for 2375 cm < d <= 2500 cm
53 cm
for 2500 cm < d <= 2750 cm
54 cm
for 2750 cm < d <= 3375 cm
55 cm
for 3375 cm < d <= 3825 cm
56 cm
for 3825 cm < d <= 4300 cm
57 cm
for 4300 cm < d <= 4800 cm
58 cm
for d > 4800 cm