![X-ray attenuation of bone, soft and adipose tissue in CT from 70 to 140 kV and comparison with 3D printable additive manufacturing materials | Scientific Reports X-ray attenuation of bone, soft and adipose tissue in CT from 70 to 140 kV and comparison with 3D printable additive manufacturing materials | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-022-18741-4/MediaObjects/41598_2022_18741_Fig1_HTML.png)
X-ray attenuation of bone, soft and adipose tissue in CT from 70 to 140 kV and comparison with 3D printable additive manufacturing materials | Scientific Reports
High-Contrast Plasmonic-Enhanced Shallow Spin Defects in Hexagonal Boron Nitride for Quantum Sensing | Nano Letters
![logistic regression - error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : contrasts can be applied only to factors with 2 or more levels, in R - Stack Overflow logistic regression - error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : contrasts can be applied only to factors with 2 or more levels, in R - Stack Overflow](https://i.stack.imgur.com/dGVk0.png)
logistic regression - error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : contrasts can be applied only to factors with 2 or more levels, in R - Stack Overflow
![conjoint analysis - R gives me the error "contrasts can be applied only to factors with 2 or more levels" running an mlogit model, but all my factors have 2 levels - Cross Validated conjoint analysis - R gives me the error "contrasts can be applied only to factors with 2 or more levels" running an mlogit model, but all my factors have 2 levels - Cross Validated](https://i.stack.imgur.com/3bk85.png)
conjoint analysis - R gives me the error "contrasts can be applied only to factors with 2 or more levels" running an mlogit model, but all my factors have 2 levels - Cross Validated
The Transition from Metal-Based to Metal-Free Contrast Agents for T1 Magnetic Resonance Imaging Enhancement | Bioconjugate Chemistry
![Insect visual sensitivity to long wavelengths enhances colour contrast of insects against vegetation | Scientific Reports Insect visual sensitivity to long wavelengths enhances colour contrast of insects against vegetation | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-021-04702-w/MediaObjects/41598_2021_4702_Fig1_HTML.png)