Swift/XRT spectra of NGC 4151 obtained as part of our 2 month continuum monitoring campaign. The spectra shown here represent the extrema of the variable internal column(s) that shape the spectrum of NGC 4151. In this analysis, changes in the unabsorbed flux are estimated by modeling the data using neutral partial-covering absorption and a simple power-law continuum. This simple treatment is a proxy for complex ionized absorption. The most highly obscured spectrum in the sequence (shown in blue) was obtained on MJD 60661.10, and the least obscured was obtained on MJD 60704.39 (shown in black).