diff --git a/SoftFever_doc/sandwich-mode1.png b/SoftFever_doc/sandwich-mode1.png new file mode 100644 index 000000000..8030c4543 Binary files /dev/null and b/SoftFever_doc/sandwich-mode1.png differ diff --git a/SoftFever_doc/sandwich-mode2.png b/SoftFever_doc/sandwich-mode2.png new file mode 100644 index 000000000..7134dea50 Binary files /dev/null and b/SoftFever_doc/sandwich-mode2.png differ