Content-Type: multipart/related; boundary="_GWT"

--_GWT
Content-Id:<r0>
Content-Type:image/png
Content-Transfer-Encoding:base64

iVBORw0KGgoAAAANSUhEUgAAAAUAAAAJCAYAAAD6reaeAAAAI0lEQVR42mNgYGD4z4AF/Mcm8R+bxH9sEv+xSRBUSdh2FAAAXN8Y6EbBLKwAAAAASUVORK5CYII=

--_GWT
Content-Id:<r1>
Content-Type:image/png
Content-Transfer-Encoding:base64

iVBORw0KGgoAAAANSUhEUgAAAAUAAAAJCAYAAAD6reaeAAAAIUlEQVR42mNgwAT/sQn8xybwH5vAf2wCuFXiNBOn7XAJAL1wGOgatBIBAAAAAElFTkSuQmCC

