inputdir{sigsbee}
multiplot{2}{img1,img2,img3,img4} %where img1-4 are within the directory sigsbee
{width=.45textwidth}{caption1;caption2;caption3;caption4}

inputdir{sigsbee2}
multiplot{2}{img1,img2,img3,img4} %where img1-4 are within the directory sigsbee2
{width=.45textwidth}{caption1;caption2;caption3;caption4}

defpath[#1]{'/path/to/file/#1'}
....
multiplot{2}{path{sigsbee}{img1,img2,img3,img4}}