Suppose that the current model specification is ga+po, which using the show command would yield the description mo = gaussian[1] + powerlaw[2].
| XSPEC> add 2 wab | | gaussian[1]+wabs[2](powerlaw[3]) |
| XSPEC> add 4 pha | | (gaussian[1]+wabs[2](powerlaw[3]))phabs[4] |
| XSPEC> del 1 | | (wabs[1](powerlaw[2]))phabs[3] |
| XSPEC> add 2 zg | | (wabs[1](zgauss[2]+powerlaw[3]))phabs[4] |
| XSPEC> del 3 | | (wabs[1](zgauss[2]))phabs[3] |
| XSPEC> add 4 bb/b | | (wabs[1](zgauss[2]))phabs[3] + bbody/b[4] |