大毘盧遮那經廣大儀軌 2.107

2.107

右赤蓮華中，觀諂（去）字光輪，
轉成大慈生。慧空水持之。

In the red lotus on the right, visualize the light-wheel of the syllable chaṃ,
which transforms into Mahāmaitryabhyudgata;
the prajñā space and water hold it.