Processing pipeline of the LOFAR-EoR flanking field data in this work to obtain the 21 cm power spectra with two different DD calibration algorithms. The pipeline is slightly different from the standard LOFAR-EoR HBA processing pipeline (Pandey et al. 2020; Mertens et al. 2020) because the main purpose is comparing the performance of two DD calibration algorithms. Two different clustering approaches are adopted for the DD calibration (i.e. the one-step and two-step methods) to investigate how different clustering impacts the subtraction of the sky model.