And of course for those who think metric . . .

Chart for determining the speed of a signal in relationship to the Effective
Dielectric Constant of the Material in which the signal is embedded.
                        Metric Version by JaMi Smith

  Er       psec         mm        dly psec    velocity    velocity
  eff     per mm     per psec      per mm      factor    factor / 1

 1.00      3.3356    0.299792      0.0000      1.0000      1.0000
 1.05      3.4180    0.292567      0.0824      0.9759      1.0247
 1.10      3.4984    0.285841      0.1628      0.9535      1.0488
 1.15      3.5771    0.279558      0.2414      0.9325      1.0724
 1.20      3.6540    0.273672      0.3184      0.9129      1.0954
 1.25      3.7294    0.268143      0.3937      0.8944      1.1180
 1.30      3.8032    0.262935      0.4676      0.8771      1.1402
 1.35      3.8757    0.258020      0.5400      0.8607      1.1619
 1.40      3.9468    0.253371      0.6111      0.8452      1.1832
 1.45      4.0166    0.248964      0.6810      0.8305      1.2042
 1.50      4.0853    0.244780      0.7497      0.8165      1.2247
 1.55      4.1528    0.240799      0.8172      0.8032      1.2450
 1.60      4.2193    0.237007      0.8836      0.7906      1.2649
 1.65      4.2847    0.233388      0.9491      0.7785      1.2845
 1.70      4.3491    0.229930      1.0135      0.7670      1.3038
 1.75      4.4126    0.226622      1.0770      0.7559      1.3229
 1.80      4.4752    0.223452      1.1396      0.7454      1.3416
 1.85      4.5370    0.220412      1.2013      0.7352      1.3601
 1.90      4.5979    0.217492      1.2622      0.7255      1.3784
 1.95      4.6580    0.214686      1.3223      0.7161      1.3964
 2.00      4.7173    0.211985      1.3817      0.7071      1.4142
 2.05      4.7759    0.209384      1.4403      0.6984      1.4318
 2.10      4.8338    0.206876      1.4982      0.6901      1.4491
 2.15      4.8910    0.204457      1.5554      0.6820      1.4663
 2.20      4.9476    0.202120      1.6119      0.6742      1.4832
 2.25      5.0035    0.199862      1.6678      0.6667      1.5000
 2.30      5.0587    0.197677      1.7231      0.6594      1.5166
 2.35      5.1134    0.195563      1.7778      0.6523      1.5330
 2.40      5.1676    0.193515      1.8319      0.6455      1.5492
 2.45      5.2211    0.191530      1.8855      0.6389      1.5652
 2.50      5.2741    0.189605      1.9385      0.6325      1.5811
 2.55      5.3266    0.187737      1.9910      0.6262      1.5969
 2.60      5.3786    0.185923      2.0429      0.6202      1.6125
 2.65      5.4300    0.184161      2.0944      0.6143      1.6279
 2.70      5.4810    0.182448      2.1454      0.6086      1.6432
 2.75      5.5315    0.180782      2.1959      0.6030      1.6583
 2.80      5.5816    0.179160      2.2460      0.5976      1.6733
 2.85      5.6312    0.177582      2.2956      0.5923      1.6882
 2.90      5.6804    0.176044      2.3448      0.5872      1.7029
 2.95      5.7292    0.174546      2.3935      0.5822      1.7176
 3.00      5.7775    0.173085      2.4419      0.5774      1.7321
 3.05      5.8254    0.171661      2.4898      0.5726      1.7464
 3.10      5.8730    0.170271      2.5374      0.5680      1.7607
 3.15      5.9202    0.168914      2.5845      0.5634      1.7748
 3.20      5.9670    0.167589      2.6313      0.5590      1.7889
 3.25      6.0134    0.166295      2.6778      0.5547      1.8028
 3.30      6.0595    0.165030      2.7239      0.5505      1.8166
 3.35      6.1052    0.163794      2.7696      0.5464      1.8303
 3.40      6.1506    0.162585      2.8150      0.5423      1.8439
 3.45      6.1957    0.161403      2.8600      0.5384      1.8574
 3.50      6.2404    0.160246      2.9048      0.5345      1.8708
 3.55      6.2848    0.159113      2.9492      0.5307      1.8841
 3.60      6.3289    0.158004      2.9933      0.5270      1.8974
 3.65      6.3727    0.156919      3.0371      0.5234      1.9105
 3.70      6.4162    0.155855      3.0806      0.5199      1.9235
 3.75      6.4594    0.154812      3.1238      0.5164      1.9365
 3.80      6.5024    0.153790      3.1667      0.5130      1.9494
 3.85      6.5450    0.152788      3.2094      0.5096      1.9621
 3.90      6.5874    0.151806      3.2517      0.5064      1.9748
 3.95      6.6295    0.150842      3.2938      0.5032      1.9875
 4.00      6.6713    0.149896      3.3356      0.5000      2.0000
 4.05      6.7128    0.148968      3.3772      0.4969      2.0125
 4.10      6.7542    0.148057      3.4185      0.4939      2.0248
 4.15      6.7952    0.147162      3.4596      0.4909      2.0372
 4.20      6.8360    0.146284      3.5004      0.4880      2.0494
 4.25      6.8766    0.145421      3.5410      0.4851      2.0616
 4.30      6.9169    0.144573      3.5813      0.4822      2.0736
 4.35      6.9570    0.143739      3.6214      0.4795      2.0857
 4.40      6.9969    0.142920      3.6613      0.4767      2.0976
 4.45      7.0365    0.142115      3.7009      0.4740      2.1095
 4.50      7.0760    0.141324      3.7403      0.4714      2.1213
 4.55      7.1152    0.140545      3.7795      0.4688      2.1331
 4.60      7.1542    0.139779      3.8185      0.4663      2.1448
 4.65      7.1929    0.139025      3.8573      0.4637      2.1564
 4.70      7.2315    0.138284      3.8959      0.4613      2.1679
 4.75      7.2699    0.137554      3.9342      0.4588      2.1794
 4.80      7.3080    0.136836      3.9724      0.4564      2.1909
 4.85      7.3460    0.136129      4.0103      0.4541      2.2023
 4.90      7.3838    0.135432      4.0481      0.4518      2.2136
 4.95      7.4213    0.134747      4.0857      0.4495      2.2249
 5.00      7.4587    0.134071      4.1231      0.4472      2.2361
 5.05      7.4959    0.133406      4.1603      0.4450      2.2472
 5.10      7.5329    0.132750      4.1973      0.4428      2.2583
 5.15      7.5698    0.132104      4.2341      0.4407      2.2694
 5.20      7.6064    0.131468      4.2708      0.4385      2.2804
 5.25      7.6429    0.130840      4.3073      0.4364      2.2913
 5.30      7.6792    0.130222      4.3436      0.4344      2.3022
 5.35      7.7154    0.129612      4.3797      0.4323      2.3130
 5.40      7.7513    0.129010      4.4157      0.4303      2.3238
 5.45      7.7871    0.128417      4.4515      0.4284      2.3345
 5.50      7.8228    0.127832      4.4871      0.4264      2.3452
 5.55      7.8582    0.127255      4.5226      0.4245      2.3558
 5.60      7.8936    0.126685      4.5579      0.4226      2.3664
 5.65      7.9287    0.126124      4.5931      0.4207      2.3770
 5.70      7.9637    0.125569      4.6281      0.4189      2.3875
 5.75      7.9986    0.125022      4.6629      0.4170      2.3979
 5.80      8.0333    0.124482      4.6976      0.4152      2.4083
 5.85      8.0678    0.123949      4.7322      0.4134      2.4187
 5.90      8.1022    0.123423      4.7666      0.4117      2.4290
 5.95      8.1365    0.122903      4.8009      0.4100      2.4393
 6.00      8.1706    0.122390      4.8350      0.4082      2.4495
 6.05      8.2046    0.121883      4.8690      0.4066      2.4597
 6.10      8.2384    0.121382      4.9028      0.4049      2.4698
 6.15      8.2721    0.120888      4.9365      0.4032      2.4799
 6.20      8.3057    0.120400      4.9700      0.4016      2.4900
 6.25      8.3391    0.119917      5.0035      0.4000      2.5000
 6.30      8.3724    0.119440      5.0368      0.3984      2.5100
 6.35      8.4056    0.118969      5.0699      0.3968      2.5199
 6.40      8.4386    0.118503      5.1029      0.3953      2.5298
 6.45      8.4715    0.118043      5.1358      0.3937      2.5397
 6.50      8.5042    0.117588      5.1686      0.3922      2.5495
 6.55      8.5369    0.117139      5.2013      0.3907      2.5593
 6.60      8.5694    0.116694      5.2338      0.3892      2.5690
 6.65      8.6018    0.116255      5.2662      0.3878      2.5788
 6.70      8.6341    0.115820      5.2985      0.3863      2.5884
 6.75      8.6662    0.115390      5.3306      0.3849      2.5981
 6.80      8.6983    0.114965      5.3626      0.3835      2.6077
 6.85      8.7302    0.114545      5.3946      0.3821      2.6173
 6.90      8.7620    0.114129      5.4264      0.3807      2.6268
 6.95      8.7937    0.113718      5.4581      0.3793      2.6363
 7.00      8.8253    0.113311      5.4896      0.3780      2.6458
 7.05      8.8567    0.112908      5.5211      0.3766      2.6552
 7.10      8.8881    0.112510      5.5524      0.3753      2.6646
 7.15      8.9193    0.112116      5.5837      0.3740      2.6739
 7.20      8.9505    0.111726      5.6148      0.3727      2.6833
 7.25      8.9815    0.111340      5.6458      0.3714      2.6926
 7.30      9.0124    0.110958      5.6768      0.3701      2.7019
 7.35      9.0432    0.110580      5.7076      0.3689      2.7111
 7.40      9.0739    0.110206      5.7383      0.3676      2.7203
 7.45      9.1045    0.109835      5.7689      0.3664      2.7295
 7.50      9.1350    0.109469      5.7994      0.3651      2.7386
 7.55      9.1654    0.109106      5.8298      0.3639      2.7477
 7.60      9.1957    0.108746      5.8601      0.3627      2.7568
 7.65      9.2259    0.108390      5.8903      0.3616      2.7659
 7.70      9.2560    0.108038      5.9204      0.3604      2.7749
 7.75      9.2860    0.107689      5.9504      0.3592      2.7839
 7.80      9.3159    0.107343      5.9803      0.3581      2.7928
 7.85      9.3457    0.107001      6.0101      0.3569      2.8018
 7.90      9.3755    0.106661      6.0398      0.3558      2.8107
 7.95      9.4051    0.106325      6.0694      0.3547      2.8196
 8.00      9.4346    0.105993      6.0990      0.3536      2.8284

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