Figure 4: Spectra retrieval times for datasets acquired on low mass resolution instruments (LTQ). The access times are much smaller than those to high mass resolution datasets, especially for random (black line) and sequential (blue line) access modes. For larger number of spectra the sequential access becomes more efficient. However, the improvement in comparison to random access mode is not as dramatic as it is for the high resolution data. The access times for readmzXML tool (green line) change marginally compared to high resolution datasets.