Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

This website has been deprecated and exists as an archive only.

The TORTOISE website has been moved to https://tortoise.nibib.nih.gov.

For any information about TORTOISE generation V3.x.x, please refer to the new website.

1.3 Installation

In this section, the installation procedure for DIFF_CALC will be described.

This software requires either a full IDL license or can be run using the precompiled IDL virtual machine (VM) distributed with the TORTOISE download.