/usr/share/xfig/Libraries/DSP/biquad.fig is in xfig-libs 1:3.2.6a-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | #FIG 3.2
Landscape
Center
Metric
Letter
100.00
Single
-2
1200 2
6 810 3690 1335 4215
1 3 0 1 0 7 50 0 -1 0.000 1 0.0000 1078 3957 257 257 1078 3957 1078 3700
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
906 3957 1249 3957
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
1078 3786 1078 4129
-6
6 3330 3690 3855 4215
1 3 0 1 0 7 50 0 -1 0.000 1 0.0000 3598 3957 257 257 3598 3957 3598 3700
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
3426 3957 3769 3957
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
3598 3786 3598 4129
-6
6 6390 3705 6915 4230
1 3 0 1 0 7 50 0 -1 0.000 1 0.0000 6658 3972 257 257 6658 3972 6658 3715
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
6486 3972 6829 3972
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
6658 3801 6658 4144
-6
6 765 3195 1170 3870
2 3 0 1 0 0 50 0 20 0.000 0 0 -1 0 0 4
1151 3203 979 3203 1065 3375 1151 3203
4 0 0 50 0 5 15 4.7124 0 180 540 808 3289 b[3]\001
-6
6 3285 3195 3690 3870
2 3 0 1 0 0 50 0 20 0.000 0 0 -1 0 0 4
3671 3203 3499 3203 3585 3375 3671 3203
4 0 0 50 0 5 15 4.7124 0 180 540 3328 3289 b[2]\001
-6
6 6345 3195 6750 3870
2 3 0 1 0 0 50 0 20 0.000 0 0 -1 0 0 4
6731 3203 6559 3203 6645 3375 6731 3203
4 0 0 50 0 5 15 4.7124 0 180 540 6388 3289 b[1]\001
-6
6 2025 3555 2775 4305
6 2046 3608 2732 4294
2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
2046 3608 2732 3608 2732 4294 2046 4294 2046 3608
4 0 0 50 0 5 17 0.0000 0 105 150 2270 4032 z\001
4 0 0 50 0 5 11 0.0000 0 105 210 2389 3927 -1\001
-6
-6
6 4725 3555 5475 4305
6 4746 3608 5432 4294
2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
4746 3608 5432 3608 5432 4294 4746 4294 4746 3608
4 0 0 50 0 5 17 0.0000 0 105 150 4970 4032 z\001
4 0 0 50 0 5 11 0.0000 0 105 210 5089 3927 -1\001
-6
-6
6 945 4095 1395 4770
2 3 0 1 0 0 50 0 20 0.000 0 0 -1 0 0 4
984 4727 1156 4727 1070 4555 984 4727
4 0 0 50 0 5 15 1.5708 0 180 540 1327 4641 a[3]\001
-6
6 3510 4050 3915 4725
2 3 0 1 0 0 50 0 20 0.000 0 0 -1 0 0 4
3511 4720 3683 4720 3597 4548 3511 4720
4 0 0 50 0 5 15 1.5708 0 180 540 3854 4634 a[2]\001
-6
6 7470 3825 8145 4275
2 3 0 1 0 0 50 0 20 0.000 0 0 -1 0 0 4
7475 3869 7475 4041 7647 3955 7475 3869
4 0 0 50 0 5 15 0.0000 0 180 540 7561 4212 a[1]\001
-6
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 3
0 0 1.00 60.00 120.00
270 2790 6660 2790 6660 3690
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
0 0 1.00 60.00 120.00
3600 2790 3600 3690
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
0 0 1.00 60.00 120.00
1080 2790 1080 3690
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
0 0 1.00 60.00 120.00
3870 3960 4725 3960
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
0 0 1.00 60.00 120.00
5445 3960 6390 3960
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
0 0 1.00 60.00 120.00
1350 3960 2025 3960
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
0 0 1.00 60.00 120.00
2745 3960 3330 3960
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
0 0 1.00 60.00 120.00
6930 3960 8325 3960
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 4
0 0 1.00 60.00 120.00
8100 3960 8100 5175 3600 5175 3600 4230
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 3
0 0 1.00 60.00 120.00
3600 5175 1080 5175 1080 4230
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