Need help interpreting line in log file

Do you know what the single letter E in a log file means?

Below I'm copying the last 18 lines from my log file. Notice the line that just contains the letter "E".

. 2017-04-24 11:31:18.081 Copying "\\jnet-b\jsWeb\projectDemographics.xml" to remote directory started.
. 2017-04-24 11:31:18.083 Binary transfer mode selected.
> 2017-04-24 11:31:18.084 T1493047867 0 1453565531 0
. 2017-04-24 11:31:18.118 SCP remote side confirmation (0)
> 2017-04-24 11:31:18.119 C0644 3774 projectDemographics.xml
. 2017-04-24 11:31:18.153 SCP remote side confirmation (0)
. 2017-04-24 11:31:18.155 Sending BINARY data (first block, 3774 bytes)
. 2017-04-24 11:31:18.157 Sending NULL.
. 2017-04-24 11:31:18.223 SCP remote side confirmation (0)
. 2017-04-24 11:31:18.224 Transfer done: '\\jnet-b\jsWeb$\projectDemographics.xml' [3774]
. 2017-04-24 11:31:18.225 Copying "\\jnet-b\jsWeb\projectDemographics.xml" to remote directory finished.
> 2017-04-24 11:31:18.226 E
. 2017-04-24 11:31:18.262 SCP remote side confirmation (0)
< 2017-04-24 11:31:18.263 WinSCP: this is end-of-file:0
> 2017-04-24 11:31:18.264 Script: close
. 2017-04-24 11:31:18.266 Closing connection.
. 2017-04-24 11:31:18.267 Sending special code: 12
. 2017-04-24 11:31:18.268 Sent EOF message

The "E" is sent to the SCP server to terminate the transfer.