- This example and the next are only heuristic, as the series in question lacks the metadata information that would be required for mapping.
- Of the 515 series currently
*( 6 Jun 2020)*in namespace**hmi**, 283 have the keyword CADENCE, while only 257 have the keyword T_REC_step.

Of the 238 series in namespace**mdi**, 67 have the keyword CADENCE and 72 have the keyword T_REC_step.

Of the 117 series in namespace**aia**, 31 have the keyword T_REC_step and 3 have the keyword CADENCE. Specifically:In namespace

**aia**, there are six time-like prime keys in various series (none has more than one):DAY 2 OBS_DATE 1 PACKET_TIME 43 T_OBS 10 T_REC 31 T_START 3

There are 3 series that have a CADENCE key, but all are variable in scope and would be ignored in favor of the corresponding prime-key stepIn namespace

**hmi**, there are six time-like prime keys in various series (none has more than one):DAY 7 MidTime 4 OBS_DATE 1 PACKET_TIME 66 T_REC 257 T_START 62

There are 35 series with a variable scope CADENCE key that would be ignored in favor of the prime key step value. There are 31 series with CADENCE keys but no time-like prime keys; none contain trackable solar imagery. There are no series for which the CADENCE key value which would be used differs from the prime key step valueIn namespace

**mdi**, there is one time_like prime key, T_REC, in 72 series. There are seven series with a variable scope CADENCE key that would be ignored in favor of the T_REC_step value. There are eleven series with CADENCE keys but no time-like prime keys; none contain solar imagery that could be used for tracking. There are eight series for which the constant CADENCE key value (which would be used) differs from the T_REC_step value:mdi.fd_Ic_06h : T_REC_step = 21600 Cadence = 60 mdi.fd_M_extract : T_REC_step = 60 Cadence = 1 mdi.fd_M_lev182 : T_REC_step = 60.0 Cadence = 1.0 mdi.fd_ic_06h_mod : T_REC_step = 21600 Cadence = 60 mdi.hr_M : T_REC_step = 60 Cadence = 1 mdi.hr_M_bin2x2 : T_REC_step = 60 Cadence = 1 mdi.hr_M_mod : T_REC_step = 60 Cadence = 1 mdi.limb_figure : T_REC_step = 720 Cadence = 60

Note that five of these clearly result from a failure to take the keyword unit into account, assuming that the CADENCE key unit is "s", when in fact it is "Minutes".