The only option you have is to download the .CSV files and import it into spreadsheets by using most popular spreadsheet application software. You can also use a third-party reporting tool to manage report data. For example, aaa-reports! by Extraxi supports ACS.
To download a CSV report:
# click Reports and Activity.
# Click the CSV report filename that you want to download.
# In the right pane of the browser, click Download.
# You can easily analyse the logs in Microsoft excel
How to filter and analyze logs ( with Regular Expression Syntax Definitions):
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...