OnOff

In the OnOff observing mode, the secondary is symmetrically wobbled around the sky direction to be observed. In this case, Eq. [*] holds with

  $\displaystyle \ensuremath{t^\ensuremath{\mathrm{}}_\ensuremath{\mathrm{\ensurem...
...{tot}}}\, \ensuremath{t^\ensuremath{\mathrm{}}_\ensuremath{\mathrm{subscan}}}.
$ (9)
In this case, the maximum number of subscans per scan and the subscan times are usually fixed to a conventional value.