大毘盧遮那經廣大儀軌 2.149

2.149

左白蓮華中，觀地㘕字光輪，
光轉行慧者。如前蓮華印。

In the white lotus on the left, visualize the light-wheel of the syllables dhīraṃ;
the light transforms into Caritamati;
[the mudrā is] like the lotus mudrā described before.