Before revision:  We propose an extension, Augmented SCM , which uses an outcome model to estimate the bias due to covariate imbalance and then de-biases the original SCM estimate , analogous to bias correction for inexact matching.
After revision:  We propose an extension, Augmented SCM , which uses an outcome model to estimate the bias due to imperfect pre-treatment fit and then de-biases the original SCM estimate , analogous to bias correction for inexact matching.