anchor.diff:  	  version: "3421.11"
   	```
   1. Visit the stemcells [section](https://bosh.io/stemcells) of bosh.io.
  -1. Locate the Ubuntu Trusty stemcell that corresponds to your IaaS and to the version specified above, and copy the URL to the stemcell. 
  +1. Locate the Ubuntu Trusty stemcell that corresponds to your IaaS and to the version specified above, and copy the URL to the stemcell.
   1. Upload the stemcell:
   	<pre class="terminal">$ bosh upload-stemcell YOUR-STEMCELL-URL</pre>
   	<p class="note"><strong>Note</strong>: If you applied the <code>windows-cell.yml</code> ops file to deploy a Windows Diego cell, you must also upload a Windows stemcell. Examine the <code>cf-deployment</code> manifest for the version number and locate the URL for the appropriate stemcell at <a href="https://bosh.io/stemcells">bosh.io</a>.</p>
  
positive.code: 
  ###<a id='optional-ops-files'></a> Identify Optional Ops Files
  
  Consult the following table to identify optional ops files. 
  
  Some of these ops files require providing variables at deploy time. For more information about how to determine variables, see the [Step 3: Determine Variables](#determine-vars) section below.
  
  
negative.code: 
  Perform the following steps to determine your required variables and prepare them for the deploy:
  
  1. Review the information in the [Step 2: Select Your Ops Files](#ops-files) section and create a list of the variables required by the ops files you have selected.
  1. Determine the values for each of the variables. For example, the `aws_region` variable required by the `use-s3-blobstore.yml` ops file may have the value of `us-west-2`.
  1. Choose one of the following methods for providing the variables when you [deploy Cloud Foundry](#deploy) below:
  	* Provide the variables in a YAML file specified with the `--vars-file` flag during the deploy. This is the recommended method for configuring external persistence services.
  