Fig. 1From: Linear MALDI-ToF simultaneous spectrum deconvolution and baseline removalA μ operator. \(\mathbf {A}_{\mu }\left (:,\lfloor {\frac {n}{2}}\rfloor \right)\) column plot for μ=1 and μ=100. A μ operator acts like a regularized second order derivation. The regularization strength increases as μ increases (μ is the background smoothness parameter)Back to article page