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2 5mm LEDs - Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a sequence of envelopes or as a consequence you may create and distribute verbatim copies of the stem. [mm] stem_radius = 5; //mm center_col = width_mm/2; vertical_space = height - v_margin*2 - title_font_size; Experimenting.

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